Hi,
I raised this issue back in March 2019, it was never fixed, but seeing as im paying a monthly fee for Emby, I think its only fair to ask to have this resolved.
This is the single most annoying annoying annoying annoying annoying thing about Emby theatre, and its so frustrating!!!!!!! for my entire family that uses our family TV/Emby system.
Emby Theatre (desktop app) does not return to full screen maximized when powering off then on a HDMI connected screen/TV. Screenshot below. I