How to move "Collapse Menu" to top of admin bar?

Question

As stated in the title, I try to perpetually move the "Collapse Menu" button which is normally the very last entry in the admin sidebar (backend) to the top. I googled but can't find any working solution.

I found that it is printed through wp-admin/menu-header.php. So I thought I could override this file with my child theme. But then, when a theme update changes the menu-header.php file, I would need to realize and reproduce these changes in the child theme as well. Not very practical...

Anybody got an ideas?

Answer 1

Rule of thumb is do not modify any core WordPress files. Those in the root, wp-includes, wp-admin. You could do this easily with JavaScript:

/**
 * Move the 'Collapse menu' item to the top of the admin menu
 *
 * @return void
 */
function wpse348570_move_collapse_menu() {

    ?>
        <script>
            if( jQuery( '#collapse-menu' ).length ) {
                jQuery( '#collapse-menu' ).prependTo( '#adminmenu' );
            }
        </script>
    <?php

}
add_action( 'admin_footer', 'wpse348570_move_collapse_menu' );

You can add the above as a plugin or place it into the child theme.