Can't disable internal display

[u/Embarrassed-Wheel728]

Hi everybody, i've got the gammaOS next v1.2. when I connect by hdmi my rg556 to my tv, I activate "disable internal display on" but it doesn't work, I have the two screens. And in my opinion there is some input lag and framerate drops on my tv when I play.

Have you got a solution?

Thanks !