x34GS - Deep Sleep OSD option missing?

I got myself a new x34GS monitor yesterday, (build Jun 2021). I have it paired with another monitor off to my right side.

I switch off my x34GS when I leave my computer on, when I turn my x34GS back on, it moves all of my Windows from my secondary monitor to my x34GS. This is super annoying. This used to happen with my old dual Xb271HU setup, and it was an issue with Deep Sleep - setting Deep Sleep to off prevented this sort of thing from happening.

I figured this would be a similar fix for my x34GS, however there is no Deep Sleep option within the monitors OSD. Does anyone know why this deep sleep option is missing, and is there possibly another administrative mode we could access to enable more options?

I hope someone else may of experienced something similar with there X34GS.

Cheers,