You bring up an interesting point: hasn’t that functionality been removed from Dorico Pro 2?
I instinctively tried to do that on the morning I installed the upgrade - for reasons of plain positioning - and got a thick grey marquee instead. Have I inadvertently unset something?
Not to derail a thread so dear to my heart, though, dragging didn’t use to fix it in v.1.
Annoyingly - or pleasantly depending on attitude - I worked for four hours yesterday in Page View with not one instance of the phenomenon. I switched to Galley: nothing.
I do appreciate how tough this must be for you to troubleshoot - even to observe - and am grateful