If you duplicate it, it will show the same things on all the screens.
If all your monitors are for your own use, then you’re able to extend your display.
This will allow you to use each screen individually and open different apps and windows across all of them.

The extended screen display will increase your productivity.
If you chose Extend these displays, then every screen will become independent.
it’s possible for you to drag your mouse cursor and windows across these displays.

Just remember to adjust the screens placement from theDisplaysettings.
However, if you chose Duplicate these displays, then all your screens will show the same thing.
Here is how:
Press Windows Key + P shortcut keys to fire up the Project quick menu.

Now you know how to extend or duplicate your screen.
Thankfully, this can also be done natively through the prefs app.
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source: www.itechtics.com