Main Menu Coding Issue

Someone just remind me what ‘ui’ does, please?

I made my own tappable menu perfectly fine without all the ‘@ui

All mine are =

@overlay OVERLAYNAME create
@overlay OVERLAYNAME opacity 1 in 1
@overlay OVERLAYNAME shifts to X Y % in Z
@overlay OVERLAYNAME scales to %

Then did that for every overlay…

Then did the tappable choice coding (: