how do i change thumbnail for iMovie project file

iMovie uses the frame that is exactly in the centre of the time line. If your movie is 5 minutes long the frame that is at 2 minutes 30 seconds is the one that will be used for the thumbnail. You can adjust this by rearranging the photos or clips or adjusting the duration of them. You will have to share/save the project back to the theatre for the thumbnail to change.

I want to change the display photo on all of my projects on the iMovie (v10.1.4) menu page but that technique in the YouTube video doesn't seem to work for that. Please let me know if I am doing it wrong.

There appears to be no way of controlling this.

Geoff.

Well spotted! Still, it does not give one much flexibility since you won't normally want to change the composition of the project just to get a different thumbnail. One could I suppose add a black background to the end of the movie.

Geoff.

iMovie uses the frame that is exactly in the centre of the time line. If your movie is 5 minutes long the frame that is at 2 minutes 30 seconds is the one that will be used for the thumbnail. You can adjust this by rearranging the photos or clips or adjusting the duration of them. You will have to share/save the project back to the theatre for the thumbnail to change.

When you save the project it shows an image in the middle of your video, then gives out a few options. Click the photo, there will be a scroll bar that you can reposition. Video for reference: https://youtu.be/S1GNZOcdoDY

thanks for that i watched your video but when i re shared my movie to the theatre it still has the same randomly placed thumbnail