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…

How can I change the time signature from 3/4 to 4/4 without

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Exporting my mp3 files that used to be musescore files to apps won

MuseScore 4: How to playback a single voice in closed SATB