Cannot remove music from Photos app Video project

I've been trying to make a video project, but i do not want any music in it. The project starts with default music, but when i try to set it to none there is no "Done" button for me to make that selection. I cannot click out of the menu, i can hit escape to close it but it reverts back to the original music.

Am I missing something obvious here?

or Serious UI problem here.