I had this discussion with another simmer the other day. I can scroll down the procedures list by just holding down left mouse click, and dragging the scroll line next to the list of procedures down to see what’s below. He/She never could get it to work like I could, and the only difference we’ve found so far is that they were in VR and I’m not.
This was on an unmodded aircraft/Garmin.
So I’m not sure if it’s somehow VR related, or a difference in mouse/controller issues in VR.
You might try in the VR part of the forum to see if anyone there has this issue and if there’s any resolution.
Regards