A: You can do it in two ways:

  1. Ignore folders: navigate to the Media Library screen -> scroll to the Folders category -> enter to it and find those folders which are not related to music -> long-press such folders and select Ignore action. After this operation unneeded audio files will be removed (ignored) from the database. Repeat the same operation for all non-music folders. You can later unignore these folders by long pressing the Folders and selecting -Ignore action.
  2. Delete default source entry and create new one which will be pointed only to the top-level music folder in your local storage: navigate to the Media Library screen -> scroll to Sources category ->inside the Sources long-press the existing source entry -> Delete. Press [+] inside the Sources section to create new source entry -> File System -> navigate to the music folder and select it -> confirm scanning.