I haven’t tried that actually, will give that a go. Running dual 48inch 4k OLEDs at 70+FPS is quite something, the 4090 is a beast. And FG makes a big difference, now the flickering is gone.
And yes like you I prefer the Experimental 2nd window, but it has this bug with Frame Generation not working!
[MODERATOR EDIT: Please do not ping team members.] please can you ask Seb if he has a moment he isnt building FS2024 
whether he could fix Frame Generation on additional windows? And do we know if this feature will ever move from Experimental?