Steinberg, I have discovered what I can only conclude must be a bug in Dorico (6.2.20 currently but observed since 6) and would like to privately provide my file to demonstrate a reproduction of the issue.
In a nutshell, whenever I toggle from Write to Engrave mode with no object selected (not the other way around) Dorico resets the scroll position back to the first page. This is in some way related to there being at least one other open tab where that tab has had its view, in Write mode, set to something other than page view. This is consistently and easily reproducible.
If Steinberg would like my file for repro. purposes, please let me know and a good email address.