Export issues
I'm new to iMovie. This morning I successfully exported from iMovie at 720p. It exported fine with proper format. Subsequent exporting only exports in 16:9 format which also crops off top and bottom - I have not changed anything (that I know of). No matter what I do I cannot get the 4:3 format back again. Please help.
OS Mojave
iMovie 10.1.13
iMac 21.5", macOS 10.13