It appears that zooming in and out using either the trackpad pinch or Cmd-scroll has broken somehow in version 4. When there’s nothing selected, it seems that Dorico takes something from the very start of the project as its zoom focus instead of what’s on screen, so zooming quickly gets more and more disorientating and unusable, the further along a project you’re viewing. It persists both in Page and Galley view, both in Write and Engrave mode. Zooming with the Z and X keys or Cmd-=/- still works as expected.
It’s certainly a bit wild when there is nothing selected, yes. This is an artifact of some of the work we did on the iPad version last year and still remains to be fully sorted out.