ZIndex only functions within a ScreenGui – outside of that, it draws them based on the order they are in the explorer AFAIK. It happens for the same reason ZIndex of SurfaceGUIs don’t function between each other – it’d just be too much of a hassle to keep track of that when it really didn’t matter that much in the first place. If you want that overlay to appear on top, you’re going to have to keep it within the menu’s ScreenGui.
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