There should be a ScreenGui in PlayerGui called “MobileControls” or something like that. You could either change it’s DisplayOrder or go in and hide the jump button.
Because the ScreenGui has a DisplayOrder property that is higher than every other ScreenGui in your game. Also protip, if you know there is only one instance of an item with that name it is more efficient to just directly access it rather than doing a for loop going through all children.