1. Once you scroll to the bottom of the list, you can just keep scrolling. I wonder if I’ll ever reach the end, I’ve been scrolling for three hours now. Restarting Dorico seems to have fixed this.
2. On my MacBook Pro (M1 Pro, 16") with an external display attached (ext. display on the left, MacBook on the right), if I have the Play window on the laptop screen, the VST dropdown list appears on the right hand edge of the external display.