I will introduce the apps I usually use when convert MusicXML to music notation.
Basically, I output MusicXML to iCloud Drive, adjust the layout with MuseScore3 running on Mac, and make a musical score. MuseScore4 has recently been released, but i am currently taking a wait-and-see approach.
I have tried several notation apps that work on iPad, but I am currently using the free version of Drico. I have not yet learned enough to adjust the layout or do any other processing.
If you know of any easy-to-use notations apps, I would appreciate it if you could let us know.