The improved version of: desktop (Scratch in Scratch!) https://scratch.mit.edu/projects/756861437/ you have to click the in-game green flag twice for some reason i dont know PLEASE read documentation carefully to see the controls and blocks available. (also you can copy/paste items directly from documentation or type it manually)
Note- New Scripts: doesnt currently do much. neither does the event blocks. you can add new when green flag clicked hatblocks but they dont do anything. some ideas from Scratch 2.0 Simulator by @CoolGuyBug https://scratch.mit.edu/projects/131559275/