Pictures cut in iMovie on iPhone and no magnifying glass available on the picture

I am trying to create a video with pictures only and my pictures are cropped! I tried to select a picture in the timeline and zoom in/out but I don‘t have the magnify glass on the top right like I read in many discussions.

What can I do to fix that?

I have a iPhone13 pro max and just updated the app (Version 3.0.3 (5815.45.84).

Thank you

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Pictures cut in iMovie on iPhone and no magnifying glass available on the picture
 
 
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