WMFS2 has tabs like i3 WM. The bottom tile has three tabs, with only one visible window. Press alt+shift+k (by default) to get a combined tabbed window.
WMFS2 utilizes a feature called "tags" which is very similar to virtual desktops. With tags, WMFS2 can display multiple desktops in a singular desktop, as well as separate ones also.
There is a bug where the tag numbers do not highlight correctly on Debian (though this may get fixed in the future and may not be a problem on other distros).