Library management

Hi, can you tell me if there’s a way to remove a single subfolder from Volumio library without running a full rescan of library path?
And one more… is there a limit to the number of folders / files Volumio can manage?

Just delete the folder in question.
Then go to the Volumio web interface,
Music Library,
use the three dots menu on the right of the music source you altered,
Update Folder (at the root level of where you removed the folder).