How do I tween transparency in a linear wipe motion?

Adding onto what admir146 said. You want to make sure the UI is properly scaled and fits off the screen. Once you make sure that the UI universally fits on all screens you want to be able to position it outside of the visible points of the screen. For example Udim2.new(0, 5, 0, 0), you can tween multiple items in one tween function. From there just tween the position to the middle of the screen.