I don't understand what happened, but most of the elements in loenn interface disappeared, including panels and context menus. Restarting or reinstalling the program doesn't help me.
#Missing loenn interface
karmic sun
vivid tartan
This happens if you try to use the search bar while the room tool is selected. Iirc restarting lönn while having the room tool selected can cause this too. To fix it go to %localappdata%\Loenn and rename the persistence.conf file to something else so lönn generates a new one. Then reopen lönn.
This is the easiest way but it will reset your favorited entities.