Can't play my scores in Musescore 4

Just got Musescore 4, put a few notes in a new piano score, the bar that's supposed to move across the page just appears and doesn't move so I can't play…

Play Won't Work!

Composition won't play back

Create your first score

Can't Update Score Name After Uploading

Playback issues

Scan Music into MuseScore

MuseScore 4 Handbook

Basics

What is this? Musescore 4 : r/Musescore

Musescore 4 It is possible to open multiple scores simultaneously