Return to gaming mode also causes that weird bug right now where green lines start spreading from the right of the device to the left, it happened to me.once so I just reboot my device when in desktop mode to get back into gaming mode.
That said, doing an actual reboot does seem to take even LONGER than going back to gaming mode normally, but that may be my imagination
Tbh, I don’t see how any of the current displays can be free from it entirely, since it shifts about depending on display hz. Just seems to vary in how strong it appears and what range of brightness it appears at. None of the games I played for the first few days had any visible mura at all, but since then I’ve tried a few which really suffer from it.