Saving and reverting layout changes
As you design a layout in Layout mode, save your work early and often. Don’t wait until you finish working. If you want to throw away the changes you’ve made and start again, you can easily revert to the last-saved version of a layout.
 
Save changes made to the current layout
Click Save Layout in the layout bar, or choose Layouts menu > Save Layout.
Revert to the last-saved version of a layout
Click Revert in the layout bar, or choose Layouts menu > Revert Layout.
Revert the last change to a layout
Choose Edit menu > Undo.
Restore the last change to a layout
Choose Edit menu > Redo.
Notes
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You can use the undo and redo features to incrementally remove or replace changes on layouts (such as changes to field labels) and changes to objects (such as moving or resizing), up to the last 1,000 changes.
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Related topics 
Saving and copying files