Make the mp3 title the filename

Pretty new to mp3tag, but I was wondering if there was an easy way to automatically make all mp3 "titles" the same as the filename.

IE: I would want the title for song.mp3 to be "song".

Any easy way to tell mp3tag to make the song title the same as the filename?
Thanks in advance!

Select the files
Press Alt+2
Format string: %title%

Thank you so much kind friend!