Change default style to have page numbers in header instead of footer
Currently in MuseScore, the default header/footer style settings puts the "$P" macro in the footers, producing page numbers at the bottom corners of the pages.
But the page numbers are at the top, not the bottom, in between 90 and 100% of the sheet music I've ever seen (whether done entirely by hand, by moveable-type press, or by modern engraving software—indeed it is the default in at least Sibelius and Finale).
For example, in my current orchestra folder (for a concert to be played tomorrow), the page numbers are in the header in: four parts that I believe were typeset in the early 20th century; one that looks like it was done with Finale; one that I think I can identify as being engraved with Encore; and two that are clearly hand-written from a long time ago. There is also one old-fashioned typeset piece that is only two pages and has no page numbers at all. But zero have the numbers at the bottom of the page.