Overview
Logic’s Music XML feature only does export, not import, which makes sense – you’re likely not bringing music into Logic to clean up the notation. You can import .smf from Sibelius or Finale for file transfers if needed.
To access the Export feature, you need to have the Score Editor open and then go the main File Menu>Export>Score as MusicXML. This will be greyed out if a Score Editor window is not open.
The score display is what is exported – make sure you have the correct tracks and number of tracks displayed. With that in mind you could do a score set of e.g., just strings and export those.
Once exported you’ll find the file with a .xml ending. If you just click to open you’ll likely not get it opened in a notation program – you can import / open via Finale / Sibelius or select one of them to open the file.
more >> “Working with the Logic Pro X MusicXML export feature”