wp_admin_bar_edit_site_menu()

wp_admin_bar_edit_site_menu( WP_Admin_Bar $wp_admin_bar )

function wp_admin_bar_edit_site_menu( $wp_admin_bar ) {
	global $_wp_current_template_id;

	// Don't show if a block theme is not activated.
	if ( ! wp_is_block_theme() ) {
		return;
	}

	// Don't show for users who can't edit theme options or when in the admin.
	if ( ! current_user_can( 'edit_theme_options' ) || is_admin() ) {
		return;
	}

	$wp_admin_bar->add_node(
		array(
			'id'    => 'site-editor',
			'title' => __( 'Edit Site' ),
			'href'  => add_query_arg(
				array(
					'postType' => 'wp_template',
					'postId'   => $_wp_current_template_id,
					'canvas'   => 'edit',
				),
				admin_url( 'site-editor.php' )
			),
		)
	);
}