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I'm trying to make the screen expand so I'm not left with any of the grey space at the sides, but I'm not sure how I can adjust the display while having the font and everything else the same size. I had it right before but I'm not sure what I did to mess up the settings for it to become like this. Can anyone help?

The picture is displayed below.

closed as off-topic by Jeff Schaller, Archemar, Stephen Rauch, user4556274, Anthon Jul 12 '17 at 16:04

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions describing a problem that can't be reproduced and seemingly went away on its own (or went away when a typo was fixed) are off-topic as they are unlikely to help future readers." – Jeff Schaller, Archemar, Stephen Rauch, user4556274
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I think you need the guest addition that you need to install on your CentOS machine: https://wiki.centos.org/HowTos/Virtualization/VirtualBox/CentOSguest

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