I installed Workspace Grid extension and the default setup came with 2 x 3 workspaces.
But, I only want 2 x 2.
I tried to edit this configuration in https://extensions.gnome.org/local/, however my Ubuntu 11.10 Oneiric Oncelot does not support the configuration button. I think it is because I can't use a newer version of Gnome Shell. Currently, I'm using GNOME Shell 18.104.22.168.
How can I change the number of workspaces without using the configuration button?