Hiding UI While Editing UI Apps

When editing UI apps, things can get misaligned due to the game keeping the tab bar on the top of the screen and the keybindings bar on the bottom. Is there a key to hide the top and bottom bars while in the UI App editing screen, to allow us to position the apps properly? Whenever I add a new app, there's a high chance that apps get shuffled and I keep finding the boost pressure app has moved itself behind the tachometer app without my input, which is quite annoying because then I have to reshuffle things until the apps stay where I want them when they all shift up or down after exiting the menu. And I can't use Alt+U since that just hides the entire UI all at once, including the UI Apps, despite me currently being in the UI App editor. Perhaps the Alt+U function can just hide all but the UI Apps when we're in the UI App editor? This way we could position things the way we want, and then exit the menu and not fear all our apps shifting into positions we didn't set them to.