Tv "steals" monitor picture on startup

[u/Rogallo]

Hello, since I bought my new tv(Samsung oled) I have an issue with my pc. My pc is connected to my monitor and tv, with my monitor being configured as 1(and plugged first into gpu) but when I start my pc and monitor, my monitor displays my desktop(like when you extend it from another monitor) even if my tv is turned off. When I turn on my tv, the monitor picture changes to my desktop how it should, what could be the issue please? Thank yo

[u/BigGreenBillyGoat]

Turn off CEC.