Q: Can I view the past settings (change history) of a display?
A: No. Promolayer does not have a feature for viewing the change history (version history) of a display's settings. When you save a display, the previous settings are overwritten and cannot be restored or viewed later.
Details
Keep a copy before you make changes
If you may want to go back to the current settings, duplicate the display before you edit it.
Open "Displays" in the admin panel.
Click "Duplicate" on the display you want to keep.
A copy named "[original title] (Copy)" is created. The copy is unpublished, so it does not appear on your site.
Edit the original display as usual. If you want to go back, publish the copy instead.
Note: The copy is created as a separate display, so its reports (impressions, clicks, etc.) start from zero.
Check the current settings
You can check a summary of a display's current settings by clicking "Display info" on the display in the "Displays" list.