We've documented a workaround/fix for this issue in the forums: https://forums.opensuse.org/showthread.php/541411-MATE-Desktop-No-Advanced-MATE-Menu-on-Panel?p=3018545#post3018545 The simple edit to the /usr/lib/mate-menu/mate-menu.py file resolves the issue with the advanced-mate menu not showing up. Not sure if folks are aware of this. This applies to Leap 15.2