Bare Bones Player Windows and Throttled Frame Rates

That’s not the same. That’s for turning off the leaderboard/topbar/developer UI in-game so you can get scenic screenshots, and it’s also on-hold because the current idea of implementing it could be used to gain an unfair advantage in some games (e.g. turning off UI when you’re blinded by a flashbang). I made a feature request specifically for disabling Studio UI here if you want to take a look at it.