Trying to export score PDF for first time

I am trying to export a PDF score for the first time, and I am having problems.

I have a single measure of piano synth. I can open the SCORES >> OPEN SCORE EDITOR and I see my piano exactly as I want it.

If I go to FILE >> EXPORT , then “Scores…” is greyed out.

I am not able to export a PDF of my piano measure. What am I doing wrong?

It’s broken, unfortunately. But you can print to a pdf, of course.