I was playing I Wanna Test The Game and realized that they managed to hide the Roblox top bar in their main menu.
I was wondering how they did it to try and recreate it for one of my games and tried the old game:GetService("StarterGui"):SetCore("TopbarEnabled", false) but it did nothing.
I also tried looking at old release notes but saw nothing.
There is another discussion based on this. Basically they set the offset of the UI topbar to off the screen, as all the old methods do not work with Roblox’s new topbar.