Remote Desktop shows secondary screen

I was using VPN and Remote Desktop to connect to my office PC from home. After a while afk the office PC locked but my home PC did not. I could see the lock screen on my office PC but on the secondary (and tertiary) screens I could still see what was on, those were not shut off:
https://twitter.com/i/status/1622695022964445208

Home PC: Win 10 Home 22H2

VPN: Windows built in

Office PC: Win 10 Pro 21H2