How to extend screen to second monitor in Linux / Fedora?

Here's the command that could extend the screen to second monitor, in case Linux does not do the job automatically:

xrandr --output VGA1 --mode 1920x1080 --output eDP1 --mode 1366x768 --left-of VGA1

Where you need to replace the screen size manually. By running xrandr in terminal, you could get the screen size range for each display output.

Beside --left-of, there are other options such as --above, --below, --right-of