I can't seem to create additional workspaces in Gnome-shell. Compiz says I should have four (2 by 2) but I only seem to have 2 set up. So, how do I create additional workspaces in gnome-shell?
First of all, gnome shell doesn't use compiz, it uses mutter.
Second, gnome shell has something that I've dubbed "auto workspace maker" - that is, as you fill up one workspace, gnome creates another for you. So if you put a window in your first workspace and your second, gnome will make you a third workspace and so on and so forth.
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Try Workspace Grid, a Gnome extension. It supports both up-down and left-right workspace navigation.