Hello, andreironyc. Thank you for posting your question to the Apple Support Communities. We understand your situation and how you are noticing that changes to your Apple Music library options are not saving as you would expect. We know that being able to keep your music organized must be important to you and we’re happy to help you research this issue.
You can typically organize your music library by category to quickly sort by artists, albums, and songs. If you are noticing that the categories do not save after you edit them, there are several steps we’d suggest starting with.
First, please be sure that your device has the latest iOS updates installed. If you are seeing an available update now, we would suggest creating a current backup of your device before installing it. The following Apple Support article can help you with this process:
Update your iPhone, iPad, or iPod touch - Apple Support
You may also find the following troubleshooting steps helpful:
If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open - Apple Support
If you continue to notice the same issue after completing the steps above, it may be necessary to contact Apple Support directly for more help. Depending on your current location, you may be able to contact Apple Support using the following link:
Get Support
We hope that this information helps you get back to organizing your library as you would like. Please let us know if you have any additional questions.
Cheers!