Leggio shows your sheet music PDFs on screen, so you can put a laptop or tablet on a music stand and play from it instead of from paper.
It keeps a library of your scores, which you can search by title, composer or tag and group into setlists. Scores open fullscreen with nothing else in the way, and pages turn instantly.
What it does:
Your PDF files are never changed. Everything Leggio saves is kept in its own library.
The Flatpak only sees the folders you give it.