Rename mask
The Rename mask defines how files renamed based on their metadata, you can select from any of the defined masks using the drop-down. When we run Correct Filename from Metadata or Correct SubFolder form Metadata it will use the rename mask selected if the song does not have the Is Compilation field set.
There are a large number of predefined rename masks available, but please realize the dropdown only shows the mask name not the actual mask, the mask name is simply an indication of what the mask should do.