Canvas: impossible to choose a custom zoom default, difficult to override in toolbar
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 184.108.40.20637, revision: b5add95
1) Edit / Preferences / Canvas / Zoom -> Percentage
2) Try changing the percentage with the checkbox arrows. I can't do that. It doesn't respond (see GIF)
3) Try now editing the text, say 120 (favorite zoom here). Save and restart, to verify.
Result, still nothing. Conclusion, I can't display a custom zoom.
And similarly, via the toolbar.
So: poor or quick or incomplete implementation, as we want, and almost zero testing time for testers/users