Decided I might try to be the third person to get a 9.84, and I've switched to my laptop, which has Fusion on it, and I can't get it to show in OBS correctly. It's not a huge black screen, it's just literally nothing, and when I click on it to enlarge it, the red dot disappears.
I've had this issue before, try searching "obs studio black screen display capture" and trying methods from videos or forum pages to fix it. Not every method works so it's just taking the time to find the one that works for you.
Update: Switched it to Window Capture and it's just a black screen now. Huh. Edit: Here's the image (Red box is where Fusion should be):
Final update: Managed to search up a solution! (Turns out many people have had problems with Fusion appearing in OBS before) I just had to disable aero in Fusion.ini.