Steps to reproduce:
1. Go to Landing page
2. Click on config button on the left upper side of Landing Page (ie. Fields, Visibility, Schedule, Layout)

Actual result:
Left Landing page tab does not have any buttons to confirm or discard changes, any change is saved after tab is closed

Expected result:
Left Landing page tab should have 'Save and close' & 'Discard' buttons as in https://www.figma.com/file/WLjvvLskcZaNAxrOcSHBUt/UX-improvements-in-4.6-LTS-%2F-Drag-and-drop-experience-in-Page-Builder?type=design&node-id=4931-84379&mode=design&t=JrMCJ4Rc1B7Ud1pg-4