Q: in full screen, iMovie does not show entire photo or title page. right side of image is cut off

Have you set the crop function of problem clip in the timeline to 'Fit' and not to 'Crop to Fill' ?

Geoff.

"when I play back in full screen"  Do you mean when you select full screen in iMovie or when you play the movie after sharing?

Strange.  Have you tried sharing to see if the problem persists?  (I doubt that it will if it plays OK in the ordinary viewer pane).  (You could copy and paste just a small part of your sideshow into a new project and share that if you don't want to share it all at this stage.)

Geoff.