MuseScore's definition of 100% zoom
I've often wondered about how MuseScore calculates what size to display the score. All levels of zoom are defined in percentages of a default "100%" zoom, but how is that 100% defined?
In LibreOffice, when zoomed to 100%, the page displayed on the screen is life-size—i.e., if the page is supposed to be 8.5" wide, you can hold up an 8.5"-wide piece of paper in front of the screen and it will line up with the displayed page.
Not so in MuseScore. An 8.5"-wide score zoomed to 100% displays as 6.375" wide. Essentially, MuseScore displays at 75% instead of 100%, and all other zoom levels are proportionally affected. Why?