Gnome Shell Dynamic Workspaces
From the tip-for-the-impatient dept. (5207) (0) by Luis
Say you want to turn off dynamic workspaces in Gnome 3 gnome-shell, all you need to do is:
gsettings set org.gnome.shell.overrides dynamic-workspaces false
Type that in a terminal and you're set! The default is 4 static workspaces.