Changing modes causes jump in the score

If nothing is selected when switching between Setup and Write in Galley View, the position in the score changes, is that an expected behavior?

I don’t find this to be the case. If you have something selected, Dorico will indeed bring it into view when you switch mode, but if you don’t, then I would expect the view to stay put, and that is what happens for me. You know what to do if you want us to investigate further.