For windows users, please add a feature to allow for a startup switch (roon -fullscreen) to start roon in full screen mode. Ideal for use when roon is a startup item on a dedicated system.
I’m sure you’ve heard this request before and I’m really surprised it hasn’t been done yet.
If you close Roon from the Full Screen state, it will still be in Full Screen when it restarts.
Where’s the close button when you’re in full screen? 
Alt and f4 in windows.
Command W on Mac.
Ah, that’s what you meant… I myself always have my laptop’s keyboard closed when using Roon since my cat always wants to walk up on it 
You can see when you hit F11.
F11 is also on the keyboard. I don’t think you understand what I meant…
Anyways, I always click on the “Enter full screen” / “Exit full screen” button.