Hi

Not a lot of information to go on here.

Please read this post and come back with more information in particular project settings, video type and resolution, export settings used.

Also on what are you viewing this for it to be cut off - if it is a TV then this is normal - depending on the the type and model you can lose up to 10 % of the visible width/height - see this article and look up Overscan in the installed MEP pdf manual

John