Hi mandy6,
If all four files are using the same version of AccountRight, the command centre layout should normally be the same across the board. The only time it might look different is if one file is in the cloud and the others are local, or if there's a newer interface showing up only after a file has been opened post-update.
Since you've already checked preferences, it might also be worth checking if the different layout shows up on another user's login or computer just to rule out any display settings.
If you're still stuck, take a screenshot of the layout that looks different and reach out to our live chat support through our virtual assistant MOCA or submit a case via MyAccount so they can double check it with you.
Regards,
Sai