The Rescan ID3 Tags button is found in the Files panel and re-reads file tags for the entire library. Use this function if you have edited or modified file tags in other software.

TIP: Rescanning the tags is a handy way to identify any files that can’t be found, for example, if the files have been re-named or moved. These tracks are then shown as orange in the library pane, with a question mark icon in the status column.