What device are you trying to use to edit? Some devices (android phone in my case) may not have the ability to edit albums from what I can see. Depending on screen resolution or window size you may need to scroll the selection pop-up to get to the “edit” section.
Thanks for writing in and welcome to the community!
@bearFNF is steering you in the right direction, let us know which device you’re having issues with, and does it happen no matter the remote device you’re using?
If you haven’t yet, I’d also stop Roon Server from running, and power cycle your devices and router. We’ll be on standby for your reply!