It's likely that the pallet got hidden behind another pallet that is floating. Or it may have gotten pushed mostly off the screen. Look around the edges of your monitor. If you can't find it buried or tucked behind something else, you can reset your UI.

In one of your old screen shots, I do see a pallet hidden behind your scene

I don't know what that pallet is. but look back there for it. Also, I see you have some of your UI dots set. Try clicking on one of those to see if it helps.

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