Hi,
Thank you for your posting!
Based on your descriptions, first I would like to explain your issue:
"1152 x 864 (4:3)" is the default screen resolution and the way that you have tried: "root user > Taskbar > Applications > System Tools > Settings > Devices > Displays" is for Ubuntu Hyper-V guests and is not suitable for CentOS and Red Hat VMs.
In this case, you can use the grubby tool to change your screen resolution in CentOS to the biggest size that you want. You can follow the steps in the video to setup:
https://www.netometer.com/blog/?p=1663
(Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.)
Thank you for your time!
Best regards
Joann
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