Set the size, orientation and/or reflection of the outputs for a screen. More information: https://www.x.org/releases/current/doc/man/man1/xrandr.1.xhtml.
xrandr --query
xrandr --auto
xrandr --output DP1 --mode 1920x1080 --rate 60
xrandr --output HDMI2 --mode 1280x1024 --right-of DP1
xrandr --output VGA1 --off
xrandr --output LVDS1 --brightness 0.5