How can I restore a Palette that was accidentally cleared?
You can restore all of GP to the latest backup, but you will lose day(s) of work with this method.
Manually re-build the palettes by going to the Omni Tools > Omni Menu screen. Highlight User Defined 1 on the left, and then click the PLUS button on the far right. This will allow you to add a menu option to the menu. You can manually rebuild the palettes to the way you’d like to see them.
There is no restore feature option.