I have the same issue. Clicking settings on the core machine (via remote desktop as that machine is tucked away with just a power cord and ethernet cable) crashes Roon.
If i click settings on my iPad the app crashes but not the core server.
It doesn’t crash on my iPhone or using the client app on my Windows 10 workstation.
A bit busy with work at the moment but if the problem persists I can dig into logs later on.
I’m lucky enough to have plenty of hardware to acess Roon but if I’d been limited to just the core and my iPad it would have been a huge issue.
I see others have mentioned Ropieee in this thread and I just added two of those having none before. No idea if it’s related just thought I’d add it as a data point for the devs looking into this,