How can I turn off individual GPU display outputs if connected to same monitor?

I have plugged in 1x DP and 1x HDMI to my GPU (7700 XT). Routed my HDMI via Soundbar (HDMI passthrough) to monitor, DP direct to Monitor.

In this case, both the output signals seems active at same time. This detects my monitor as an ultrawide. I can make secondary and primary display switch but it's buggy and the resolution stays high which drops frames in games.

Alternatively, I have now taken the HDMI output from iGPU (7600) in which I can switch easily as one GPU sends signal at one time. But I can't game with iGPU.

Wanted this setup to enjoy good sound in laid back story games while DP was for FPS/ Comps. I can use 3.5mm but as we know HDMI as much more bandwidth and I am a sucker for everything high quality.

Anyone aware of any solution/ app so I can turn of indivdual output from dGPU itself? The Adrenaline app doesn't provide any such options it seems.