If you see the same thing on both displays, you should start by making sure the displays are Extended instead of Mirroring ...

Unfortunately, there’s no way to set the Razr to automatically open apps in full screen on the external display. The thought process here is likely that, you won’t want to always do this.

If you want everyone to be comfortable, especially as far as your vision is concerned, then you should have the full-screen monitor display on this resolution.

When you want to make the most of your display, Windows offers a number of ways of taking apps full screen.

Going into “full-screen” mode on my apps causes my second display to go black. It just started doing this today after I did a restart. I am using a new 27-inch iMac running El Capitan.

How to use the Flip 4’s cover screen As mentioned, the Galaxy Z Flip 4’s cover screen is more of an information display than a way to use the phone and all of its features.

Run any app on your Galaxy Z Flip 4's external display and reply to notifications without opening your phone using these hacks.

If one screen isn't enough to display everything you need at once, consider getting a second. Here's how to manage multiple screens in macOS.

Are apps not using the full screen on your Galaxy S10? Here's how to enable or force apps into full-screen mode.