PC reverts to “strange” screen overnight?

Hey all, PC connected to TV via HDMI. Full screen ok, but when i turn on tv after overnight, its mostly my Windows & desktop with a very small, vertical window for Kodi that’s barely legible. I cant get it back to full with remote without closing Kodi and restarting. Any tips, suggestions, solutions for this? I would like to run Kodi 24/7 on PC and be able to bring it up instantly when I change TV input. Thanks all.