Collections missing after uninstalling “Media Bar” and “Modular Home Sections”

[Frit92]

Hey everyone,

I’m running Jellyfin 10.11.0 on Ubuntu 24.04 and ever since uninstalling the plugins
Media Bar and Modular Home Sections, my Collections feature has completely broken:

• All existing Collections (BoxSets) disappeared. 
  
• The “Collections” menu item itself is missing from the home page.
  
• Collections still appear under the Movies library if I enable “Group movies into collections” in the display settings.
  
• Newly created collections appear temporarily, but vanish again after leaving the page.
  
• In other words: the collection data exists, but the UI seems to have lost the “Collections” view registration.
  

What I already tried:

• Cleared all cache and metadata folders
  
• Checked file permissions
  
• Reinstalled and then uninstalled the two plugins again
  

Could uninstalling Media Bar or Modular Home Sections have removed or corrupted the home layout registration for Collections?
How can I safely re-register or rebuild the Collections menu and home view without losing my collection data?

Thanks a lot in advance 🙏