imovie only creates movies in 720p but i need 1080p
i've been struggling to export movies in 1080p, which i have done before so i don't think my footage is the problem. when i create a movie it's automatically set for 720p and i've been tinkering around trying to change it to 1080p but so far nothing has worked.
iMovie 10, OS X Yosemite (10.10.5)