Q: Switch from mirrored to extended displays I have multiple monitors and I was using extended display, so I can drag windows from one monitor to the next. 
I accidentally pressed some keyboard shortcut and now I have mirrored displays. I want to go back to extended.
How can I fix this?

A: If you are a Gnome 3 user, the hotkey was Super+P
You can use the hotkey combination to switch back, or go to Settings->Displays to reconfigure your setup.

A: *

*Install arandr (apt-get install arandr).

*Launch arandr.

*Drag screen one next to other.

*Validate.

A: Open system settings > displays. For each monitor, turn it off with the on/off slider, then turn it back on. This brought back extended displays.
