First, let me turn my UI Visibility off so I can’t see the UI while I’m building. Let’s insert a part. Oops, I accidently inserted a sphere instead of a regular rectangular part. Let’s press the undo button.
Under this situation, the sphere would be deleted AND the UI Visibility would be set to false again. Obviously this isn’t supposed to happen since it’s on the VIEW tab and not in the actual game. This would be like turning on Wireframe Rendering and having it turned back off when pressing the Undo button.
Happens in any game for anyone, tried reinstalling Roblox Studio. You can easily reproduce this by inserting a gui, turning off UI Visibility, inserting a part, and clicking the Undo button.
Expected behavior
The UI Visibility should stay set to what you originally had it set to after using the unfo button.