Trying to create a shortcut to take the active window and display it across two displays. Using the following only maximizes it on a single monitor:
wmctrl -r :ACTIVE: -e 0,0,0,1800,2300
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Right click on the DF taskbar and select Settings.
Click on the Functions tab on the left.
Scroll down and you will see Span Window Across all Monitors and the keyboard shortcut for it.
After you have spanned a window you can revert back by using the same shortcut.
You can change the shortcut if you want by double clicking on it.