Screenrecording leaves white margins around the app window

Hi

I was hoping I could figure this one out but I have spent a considerable amount of time but not much luck.

I have tried to create an app simulation but the recorded screen has white borders around the entire window.

This will not be giving my client's learners the best experience.

Has anyone here had this issue and had a solution?  Please let me know.

I am sure its a simple solution.

Keep up the great work.

Gary