Hiding images that you've already added

Yes, you can hide a photo in the Media Library browser, that has been added to the timeline.

Add your photo to the timeline. Click on Library in the Media sidebar. Find your photo in the displayed library photos. Select the photo. Click on Mark/Reject. A red line will appear across the top of the clip. Then choose Hide Rejected from the pop up menu that appears just to the left of the seach feature icon (the Q:).

-- Rich

There is no way to automatically hide clips in the browser after you add them to the timeline. In the view menu you can select 'used media ranges' which will place an orange line under the clip in the browser once it has been placed in the timeline. If you really want to hide clips you have used in the timeline you can reject them in the browser and choose 'hide rejected' in the drop down menu at the top of the browser. This will hide the clips in the browser and not affect them in the timeline.

You are welcome. iMovie 10 did make changes from previous version.

-- Rich