I am personally one of the people who likes to use a standalone window manager. Unlike many desktop environments, when using a standalone window manager like Openbox, i3, or BSPWM, there is no tool to configure the monitors on your own that comes pre-installed. Arandr is a Gui tool for the display configuration tool Xrandr. I am going to show you how you can install and use Arandr to configure your monitors.