changing default centos 7 workspaces

On CentOS7, using the gnome environment, I do not seem to be able to add, remove, or change the workspaces.

I prefer to have 2 workspaces, or no workspaces, and understand the usefulness of the feature, however, whenever I right click a workspace, it selects the workspace as active, instead of providing additional options for edits to be made as I am used to.