Per default VidiEditor publishes the video in its orginal aspect ration without any crop applied. For the publish of videos for mobiles, VidiEditor allows to switch the aspect ratio via a dropdown in the timeline player.
VidiEditor allows one to switch from standard to:
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16:9
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9:16
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4:3
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1:1
After selecting any of the listed options you will see the visible area with a greyed out area around it. The greyed out area will be cropped during publish process.