If you are using Remote Desktop, and it looks minimized (with scroll bars) and maximizing it doesn’t fix the issue, here is a quick fix!
If you are using an icon on your desktop for RDP, right click on it and choose “edit”. From there, choose the display tab and set it for “Full Screen”. Hit connect at the bottom and you should be good to go!
If you aren’t using an Icon, just hit the options button to make these options come up and do the same thing as someone with an icon! Once you hit connect, you will be full screen.