Dual monitor workspaces in Ubuntu 18.04

Had the same problem. Turned out it was super easy to fix.

Install the GNOME Tweaks app. Go to Workspaces and set Display handling to Workspaces span displays. Done!

You can change this behaviour by executing:

gsettings set org.gnome.mutter workspaces-only-on-primary false

You can install gnome-tweak-tool via sudo apt install gnome-tweak-tool.

Then go to Workspaces > Display Handling > And choose Workspaces span displays

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