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EDIT :: themes.php

<?php
/**
 * Multisite themes administration panel.
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.1.0
 */

/** Load WordPress Administration Bootstrap */
require_once __DIR__ . '/admin.php';

if ( ! current_user_can( 'manage_network_themes' ) ) {
	wp_die( __( 'Sorry, you are not allowed to manage network themes.' ) );
}

$wp_list_table = _get_list_table( 'WP_MS_Themes_List_Table' );
$pagenum       = $wp_list_table->get_pagenum();

$action = $wp_list_table->current_action();

$s = isset( $_REQUEST['s'] ) ? $_REQUEST['s'] : '';

// Clean up request URI from temporary args for screen options/paging uri's to work as expected.
$temp_args = array(
	'enabled',
	'disabled',
	'deleted',
	'error',
	'enabled-auto-update',
	'disabled-auto-update',
);

$_SERVER['REQUEST_URI'] = remove_query_arg( $temp_args, $_SERVER['REQUEST_URI'] );
$referer                = remove_query_arg( $temp_args, wp_get_referer() );

if ( $action ) {
	switch ( $action ) {
		case 'enable':
			check_admin_referer( 'enable-theme_' . $_GET['theme'] );
			WP_Theme::network_enable_theme( $_GET['theme'] );
			if ( ! str_contains( $referer, '/network/themes.php' ) ) {
				wp_redirect( network_admin_url( 'themes.php?enabled=1' ) );
			} else {
				wp_safe_redirect( add_query_arg( 'enabled', 1, $referer ) );
			}
			exit;
		case 'disable':
			check_admin_referer( 'disable-theme_' . $_GET['theme'] );
			WP_Theme::network_disable_theme( $_GET['theme'] );
			wp_safe_redirect( add_query_arg( 'disabled', '1', $referer ) );
			exit;
		case 'enable-selected':
			check_admin_referer( 'bulk-themes' );
			$themes = isset( $_POST['checked'] ) ? (array) $_POST['checked'] : array();
			if ( empty( $themes ) ) {
				wp_safe_redirect( add_query_arg( 'error', 'none', $referer ) );
				exit;
			}
			WP_Theme::network_enable_theme( (array) $themes );
			wp_safe_redirect( add_query_arg( 'enabled', count( $themes ), $referer ) );
			exit;
		case 'disable-selected':
			check_admin_referer( 'bulk-themes' );
			$themes = isset( $_POST['checked'] ) ? (array) $_POST['checked'] : array();
			if ( empty( $themes ) ) {
				wp_safe_redirect( add_query_arg( 'error', 'none', $referer ) );
				exit;
			}
			WP_Theme::network_disable_theme( (array) $themes );
			wp_safe_redirect( add_query_arg( 'disabled', count( $themes ), $referer ) );
			exit;
		case 'update-selected':
			check_admin_referer( 'bulk-themes' );

if ( isset( $_GET['themes'] ) ) {
				$themes = explode( ',', $_GET['themes'] );
			} elseif ( isset( $_POST['checked'] ) ) {
				$themes = (array) $_POST['checked'];
			} else {
				$themes = array();
			}

// Used in the HTML title tag.
			$title       = __( 'Update Themes' );
			$parent_file = 'themes.php';

require_once ABSPATH . 'wp-admin/admin-header.php';

echo '<div class="wrap">';
			echo '<h1>' . esc_html( $title ) . '</h1>';

$url = self_admin_url( 'update.php?action=update-selected-themes&amp;themes=' . urlencode( implode( ',', $themes ) ) );
			$url = wp_nonce_url( $url, 'bulk-update-themes' );

echo "<iframe src='$url' style='width: 100%; height:100%; min-height:850px;'></iframe>";
			echo '</div>';
			require_once ABSPATH . 'wp-admin/admin-footer.php';
			exit;
		case 'delete-selected':
			if ( ! current_user_can( 'delete_themes' ) ) {
				wp_die( __( 'Sorry, you are not allowed to delete themes for this site.' ) );
			}

check_admin_referer( 'bulk-themes' );

$themes = isset( $_REQUEST['checked'] ) ? (array) $_REQUEST['checked'] : array();

if ( empty( $themes ) ) {
				wp_safe_redirect( add_query_arg( 'error', 'none', $referer ) );
				exit;
			}

$themes = array_diff( $themes, array( get_option( 'stylesheet' ), get_option( 'template' ) ) );

if ( empty( $themes ) ) {
				wp_safe_redirect( add_query_arg( 'error', 'main', $referer ) );
				exit;
			}

$theme_info = array();
			foreach ( $themes as $key => $theme ) {
				$theme_info[ $theme ] = wp_get_theme( $theme );
			}

require ABSPATH . 'wp-admin/update.php';

$parent_file = 'themes.php';

if ( ! isset( $_REQUEST['verify-delete'] ) ) {
				wp_enqueue_script( 'jquery' );
				require_once ABSPATH . 'wp-admin/admin-header.php';
				$themes_to_delete = count( $themes );
				?>
				<div class="wrap">
				<?php if ( 1 === $themes_to_delete ) : ?>
					<h1><?php _e( 'Delete Theme' ); ?></h1>
					<?php
					wp_admin_notice(
						'<strong>' . __( 'Caution:' ) . '</strong> ' . __( 'This theme may be active on other sites in the network.' ),
						array(
							'additional_classes' => array( 'error' ),
						)
					);
					?>
					<p><?php _e( 'You are about to remove the following theme:' ); ?></p>
				<?php else : ?>
					<h1><?php _e( 'Delete Themes' ); ?></h1>
					<?php
					wp_admin_notice(
						'<strong>' . __( 'Caution:' ) . '</strong> ' . __( 'These themes may be active on other sites in the network.' ),
						array(
							'additional_classes' => array( 'error' ),
						)
					);
					?>
					<p><?php _e( 'You are about to remove the following themes:' ); ?></p>
				<?php endif; ?>
					<ul class="ul-disc">
					<?php
					foreach ( $theme_info as $theme ) {
						echo '<li>' . sprintf(
							/* translators: 1: Theme name, 2: Theme author. */
							_x( '%1$s by %2$s', 'theme' ),
							'<strong>' . $theme->display( 'Name' ) . '</strong>',
							'<em>' . $theme->display( 'Author' ) . '</em>'
						) . '</li>';
					}
					?>
					</ul>
				<?php if ( 1 === $themes_to_delete ) : ?>
					<p><?php _e( 'Are you sure you want to delete this theme?' ); ?></p>
				<?php else : ?>
					<p><?php _e( 'Are you sure you want to delete these themes?' ); ?></p>
				<?php endif; ?>
				<form method="post" action="<?php echo esc_url( $_SERVER['REQUEST_URI'] ); ?>" style="display:inline;">
					<input type="hidden" name="verify-delete" value="1" />
					<input type="hidden" name="action" value="delete-selected" />
					<?php

foreach ( (array) $themes as $theme ) {
						echo '<input type="hidden" name="checked[]" value="' . esc_attr( $theme ) . '" />';
					}

wp_nonce_field( 'bulk-themes' );

if ( 1 === $themes_to_delete ) {
						submit_button( __( 'Yes, delete this theme' ), '', 'submit', false );
					} else {
						submit_button( __( 'Yes, delete these themes' ), '', 'submit', false );
					}

?>
				</form>
				<?php $referer = wp_get_referer(); ?>
				<form method="post" action="<?php echo $referer ? esc_url( $referer ) : ''; ?>" style="display:inline;">
					<?php submit_button( __( 'No, return me to the theme list' ), '', 'submit', false ); ?>
				</form>
				</div>
				<?php

require_once ABSPATH . 'wp-admin/admin-footer.php';
				exit;
			} // End if verify-delete.

foreach ( $themes as $theme ) {
				$delete_result = delete_theme(
					$theme,
					esc_url(
						add_query_arg(
							array(
								'verify-delete' => 1,
								'action'        => 'delete-selected',
								'checked'       => $_REQUEST['checked'],
								'_wpnonce'      => $_REQUEST['_wpnonce'],
							),
							network_admin_url( 'themes.php' )
						)
					)
				);
			}

$paged = ( $_REQUEST['paged'] ) ? $_REQUEST['paged'] : 1;
			wp_redirect(
				add_query_arg(
					array(
						'deleted' => count( $themes ),
						'paged'   => $paged,
						's'       => $s,
					),
					network_admin_url( 'themes.php' )
				)
			);
			exit;
		case 'enable-auto-update':
		case 'disable-auto-update':
		case 'enable-auto-update-selected':
		case 'disable-auto-update-selected':
			if ( ! ( current_user_can( 'update_themes' ) && wp_is_auto_update_enabled_for_type( 'theme' ) ) ) {
				wp_die( __( 'Sorry, you are not allowed to change themes automatic update settings.' ) );
			}

if ( 'enable-auto-update' === $action || 'disable-auto-update' === $action ) {
				check_admin_referer( 'updates' );
			} else {
				if ( empty( $_POST['checked'] ) ) {
					// Nothing to do.
					wp_safe_redirect( add_query_arg( 'error', 'none', $referer ) );
					exit;
				}

check_admin_referer( 'bulk-themes' );
			}

$auto_updates = (array) get_site_option( 'auto_update_themes', array() );

if ( 'enable-auto-update' === $action ) {
				$auto_updates[] = $_GET['theme'];
				$auto_updates   = array_unique( $auto_updates );
				$referer        = add_query_arg( 'enabled-auto-update', 1, $referer );
			} elseif ( 'disable-auto-update' === $action ) {
				$auto_updates = array_diff( $auto_updates, array( $_GET['theme'] ) );
				$referer      = add_query_arg( 'disabled-auto-update', 1, $referer );
			} else {
				// Bulk enable/disable.
				$themes = (array) wp_unslash( $_POST['checked'] );

if ( 'enable-auto-update-selected' === $action ) {
					$auto_updates = array_merge( $auto_updates, $themes );
					$auto_updates = array_unique( $auto_updates );
					$referer      = add_query_arg( 'enabled-auto-update', count( $themes ), $referer );
				} else {
					$auto_updates = array_diff( $auto_updates, $themes );
					$referer      = add_query_arg( 'disabled-auto-update', count( $themes ), $referer );
				}
			}

$all_items = wp_get_themes();

// Remove themes that don't exist or have been deleted since the option was last updated.
			$auto_updates = array_intersect( $auto_updates, array_keys( $all_items ) );

update_site_option( 'auto_update_themes', $auto_updates );

wp_safe_redirect( $referer );
			exit;
		default:
			$themes = isset( $_POST['checked'] ) ? (array) $_POST['checked'] : array();
			if ( empty( $themes ) ) {
				wp_safe_redirect( add_query_arg( 'error', 'none', $referer ) );
				exit;
			}
			check_admin_referer( 'bulk-themes' );

/** This action is documented in wp-admin/network/site-themes.php */
			$referer = apply_filters( 'handle_network_bulk_actions-' . get_current_screen()->id, $referer, $action, $themes ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores

wp_safe_redirect( $referer );
			exit;
	}
}

$wp_list_table->prepare_items();

add_thickbox();

add_screen_option( 'per_page' );

get_current_screen()->add_help_tab(
	array(
		'id'      => 'overview',
		'title'   => __( 'Overview' ),
		'content' =>
			'<p>' . __( 'This screen enables and disables the inclusion of themes available to choose in the Appearance menu for each site. It does not activate or deactivate which theme a site is currently using.' ) . '</p>' .
			'<p>' . __( 'If the network admin disables a theme that is in use, it can still remain selected on that site. If another theme is chosen, the disabled theme will not appear in the site&#8217;s Appearance > Themes screen.' ) . '</p>' .
			'<p>' . __( 'Themes can be enabled on a site by site basis by the network admin on the Edit Site screen (which has a Themes tab); get there via the Edit action link on the All Sites screen. Only network admins are able to install or edit themes.' ) . '</p>',
	)
);

$help_sidebar_autoupdates = '';

if ( current_user_can( 'update_themes' ) && wp_is_auto_update_enabled_for_type( 'theme' ) ) {
	get_current_screen()->add_help_tab(
		array(
			'id'      => 'plugins-themes-auto-updates',
			'title'   => __( 'Auto-updates' ),
			'content' =>
				'<p>' . __( 'Auto-updates can be enabled or disabled for each individual theme. Themes with auto-updates enabled will display the estimated date of the next auto-update. Auto-updates depends on the WP-Cron task scheduling system.' ) . '</p>' .
				'<p>' . __( 'Please note: Third-party themes and plugins, or custom code, may override WordPress scheduling.' ) . '</p>',
		)
	);

$help_sidebar_autoupdates = '<p>' . __( '<a href="https://wordpress.org/documentation/article/plugins-themes-auto-updates/">Documentation on Auto-updates</a>' ) . '</p>';
}

get_current_screen()->set_help_sidebar(
	'<p><strong>' . __( 'For more information:' ) . '</strong></p>' .
	'<p>' . __( '<a href="https://codex.wordpress.org/Network_Admin_Themes_Screen">Documentation on Network Themes</a>' ) . '</p>' .
	$help_sidebar_autoupdates .
	'<p>' . __( '<a href="https://wordpress.org/support/forums/">Support forums</a>' ) . '</p>'
);

get_current_screen()->set_screen_reader_content(
	array(
		'heading_views'      => __( 'Filter themes list' ),
		'heading_pagination' => __( 'Themes list navigation' ),
		'heading_list'       => __( 'Themes list' ),
	)
);

// Used in the HTML title tag.
$title       = __( 'Themes' );
$parent_file = 'themes.php';

wp_enqueue_script( 'updates' );
wp_enqueue_script( 'theme-preview' );

require_once ABSPATH . 'wp-admin/admin-header.php';

<?php if ( current_user_can( 'install_themes' ) ) : ?>
	<a href="theme-install.php" class="page-title-action"><?php echo esc_html__( 'Add Theme' ); ?></a>
<?php endif; ?>

<?php
if ( isset( $_REQUEST['s'] ) && strlen( $_REQUEST['s'] ) ) {
	echo '<span class="subtitle">';
	printf(
		/* translators: %s: Search query. */
		__( 'Search results for: %s' ),
		'<strong>' . esc_html( $s ) . '</strong>'
	);
	echo '</span>';
}
?>

<?php
$message = '';
$type    = 'success';

if ( isset( $_GET['enabled'] ) ) {
	$enabled = absint( $_GET['enabled'] );
	if ( 1 === $enabled ) {
		$message = __( 'Theme enabled.' );
	} else {
		$message = sprintf(
			/* translators: %s: Number of themes. */
			_n( '%s theme enabled.', '%s themes enabled.', $enabled ),
			number_format_i18n( $enabled )
		);
	}
} elseif ( isset( $_GET['disabled'] ) ) {
	$disabled = absint( $_GET['disabled'] );
	if ( 1 === $disabled ) {
		$message = __( 'Theme disabled.' );
	} else {
		$message = sprintf(
			/* translators: %s: Number of themes. */
			_n( '%s theme disabled.', '%s themes disabled.', $disabled ),
			number_format_i18n( $disabled )
		);
	}
} elseif ( isset( $_GET['deleted'] ) ) {
	$deleted = absint( $_GET['deleted'] );
	if ( 1 === $deleted ) {
		$message = __( 'Theme deleted.' );
	} else {
		$message = sprintf(
			/* translators: %s: Number of themes. */
			_n( '%s theme deleted.', '%s themes deleted.', $deleted ),
			number_format_i18n( $deleted )
		);
	}
} elseif ( isset( $_GET['enabled-auto-update'] ) ) {
	$enabled = absint( $_GET['enabled-auto-update'] );
	if ( 1 === $enabled ) {
		$message = __( 'Theme will be auto-updated.' );
	} else {
		$message = sprintf(
			/* translators: %s: Number of themes. */
			_n( '%s theme will be auto-updated.', '%s themes will be auto-updated.', $enabled ),
			number_format_i18n( $enabled )
		);
	}
} elseif ( isset( $_GET['disabled-auto-update'] ) ) {
	$disabled = absint( $_GET['disabled-auto-update'] );
	if ( 1 === $disabled ) {
		$message = __( 'Theme will no longer be auto-updated.' );
	} else {
		$message = sprintf(
			/* translators: %s: Number of themes. */
			_n( '%s theme will no longer be auto-updated.', '%s themes will no longer be auto-updated.', $disabled ),
			number_format_i18n( $disabled )
		);
	}
} elseif ( isset( $_GET['error'] ) && 'none' === $_GET['error'] ) {
	$message = __( 'No theme selected.' );
	$type    = 'error';
} elseif ( isset( $_GET['error'] ) && 'main' === $_GET['error'] ) {
	$message = __( 'You cannot delete a theme while it is active on the main site.' );
	$type    = 'error';
}

if ( '' !== $message ) {
	wp_admin_notice(
		$message,
		array(
			'type'        => $type,
			'dismissible' => true,
			'id'          => 'message',
		)
	);
}
?>

<form method="get">
<?php $wp_list_table->search_box( __( 'Search installed themes' ), 'theme' ); ?>
</form>

<?php
$wp_list_table->views();

if ( 'broken' === $status ) {
	echo '<p class="clear">' . __( 'The following themes are installed but incomplete.' ) . '</p>';
}
?>

<?php $wp_list_table->display(); ?>
</form>

</div>

<?php
wp_print_request_filesystem_credentials_modal();
wp_print_admin_notice_templates();
wp_print_update_row_templates();

require_once ABSPATH . 'wp-admin/admin-footer.php';

CANCEL

// SYSTEM PANEL //

EDIT :: themes.php