I have been trying to eliminate the FileMaker Pro Advanced bar on my Layout, Start Up Screen.
So far the only way to do this is Manually touch the Green Circle Maximize button you see in the photo.
I am sure this is a newbie problem,
but all my experience is from Microsoft Access 2.0 where I would just attach a Maximize macro on StartUp to the From.
I am running FMPro13 Advanced on MacOS Sierra