Thanks to all the thread I was able to do it
My machine is a laptop and was connected to a second screen via display port
So I have not modified the .xinicrt since I didn't find it but I manually ran the following
DISPLAY=:0 xrandr --listmonitors
Then I had two connected monitors
eDP-1
And DP-1
So I did DISPLAY=:0 xrandr --output eDP1 --off
And the laptop screen went black
After that I did DISPLAY=:0 xrandr --output DP-1 primary
And then I clicked escape on the laptop and I was back in the main screen displayed on the tv
Thank you so much for your investigation and output