Hello dear colleagues and team,
I support the screen estate suggestion. Surely it will save a lot of screen space, especially if you are using two Dorico windows on single screen.
On the screenshot you can see in the enclosed in red zones, which can be reduced:
In previous feature request I’d asked for workflow improvement, which will also solve the screen spacing “problem”:
I still hope the team will be able to see the positives in bringing an instant access to the Piano Roll in Write Mode > Galley View.
Thank you in advance! 
Best regards,
Thurisaz