This is a fairly minor issue, but I just wanted to point out a place where Dorico is behaving a bit unintuitively.
When you’ve got a split window, using a trackpad to move the field of view around works as expected—it controls whichever side the mouse is hovering over. However, using the mouse to zoom works on whichever window is “in focus” regardless of where the mouse is hovering. Again, minor, but a bit confusing, as you intuitively want to be able to pinch-to-zoom whatever window section you hover over.
Of course, zooming with key commands should follow the focus, not the mouse location, so these should be independent of one another.