xrandr is an official configuration utility to the RandR X Window System extension. It can be used to set the size, orientation or reflection of the outputs for a screen. For configuring multiple monitors see the Multihead page.
◙ Instructions :
• First you need to enter the following command
$ xrandr
this will display the allowed resolutions
• Then set the resolution you want to use
$ xrandr -s your desired resolution
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