Options under "File" grayed out - can't save, export, etc

I'm setting up a brand new macbook pro (Sequoia 15.1.1) and am baffled. I was trying to export the audio for an arrangement and, as you can see from the screenshot below, my 'File' options are limited to New, Open and Import PDF. I had no issues with this score on my previous computer.

When I went to open a random older score I had no issues. All 'File' options were available to me.