In EW6, how can you turn off repeat for a video background to a song?

I go to the song's master slide, open inspector and select "Media Fill" for the background. I add the video media (a sunrise time-lapse). I can edit the aspect ratio ok to fill the display, but I cannot change the repeating setting from Auto? Every time I click "Repeat Off" button, it switches back to auto after about a half second.

The effect I'm looking for is for my sunrise time-lapse to finish and just stop on the last frame of the video (a nice morning sky).

Hi!

In the Inspector set the media usage to Foreground and then it will not loop.