External monitor w/ mbp - display has 1" border that is blank -- doesn't fill out screen  can this be adjusted?

how to configure external monitor so that content fills the screen.  blank border around edges aren't taking advantage of full screen and is annoying.
thanks for any help you can provide

jvaughan68 wrote:
Thanks Bob,
new monitor is 1080p and i'm using mirrored mode -- don't see extended mode as an option -- suggestions on where to find that?  Sorry, rookie here
Uncheck Mirrored, you'll then be in Extended mode:

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