I’m using a Eizo FlexScan EV2730Q perfectly square 26" monitor which is excellent for creative work, you can comfortably view the full score. In the old days monitors were squareish (5:4 usually), when computers became media devices for watching film and playing games the landscape format became standard. But for document work flipped landscape or square is best. I can highly recommend this screen for Dorico work - even better because it’s narrower than most landscape monitors you can more easily fit it between your speaker monitors.
Anyhow Dorico is a bit inflexible with this and carries something of a bias towards landscape. Look at this screen shot on my Eizo
The side frames can’t be mimized, and the expanded frames always take up horizontal space, wasting a lot of vertical. Request to support docking the side windows for a more efficient layout. The notes pane could easily be docked below the tools pane on the left hand side for example.