Fix WordPress Admin Panel Menu Width

Issue

Menu Pro background not collapsing on full screen editing, such as formidable forms.

Solution

1. Go to Settings > Menu Editor Pro
2. Click on “Tweak” tab
3. Open “Admin CSS”
4. Activate “Add Custom Admin CSS”
5. Paste the following:
   body.wp-admin #adminmenu, body.wp-admin #adminmenu .wp-submenu, body.wp-admin #adminmenuback, body.wp-admin #adminmenuwrap {width:auto!important; max-width:170px!important;}
6. Click Save Changes