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Customize sharing options in iMovie on iPhone
You can rearrange items or set which items appear in the iMovie share menu.
In the iMovie app
on your iPhone, tap a project in the Projects browser, then tap the Share button 
at the bottom of the screen.Tap either Share Video or Export Project, swipe left over the row of buttons, tap More, then tap Edit.
Do any of the following:
Show an item: Tap to turn it on.
Hide an item: Tap to turn it off.
Add an item to Favourites: Tap the Add button (+).
Remove an item from Favourites: Tap the Remove button (–).
Rearrange Favourites: Drag the Rearrange button
for each menu item you want to move.
Tap Done.