I know I am late to the party here, but I used this tutorial for my Ubuntu Mate installs.
I am on 22.04. Unfortunately, the i3wm in the repos is an older version, so you can't add gaps. The gaps make it a bit nicer on the eyes to me.
The 1st screenshot is on an old Dell 19" monitor. I don't work with my windows that way typically. I make use of the workspaces heavily.
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