MacBook Pro 16" frame always scrolls when on fullscreen on my MacBook Pro 16"

Seeing as the device I am using and the frame I am using are the same size, why is it then when I press the “Present” button (the play icon) and go to full screen, it always scrolls. I want it to take up the size of my screen - nothing more or less…

My mac is: MacBook Pro 2021 16-inch (3456 × 2234) Liquid Retina XDR Display