Easy! In the left pane, where you see all your topics, there
are 4 icons (tiny, but there) at the top of the list. One, when you
hover over it, says Toggle Project Manager View. It's the first
icon, a folder with a blue something in front of it. Click on it,
and you'll see the TOC item on the collapsed menu. Right -Click on
TOC, to add a new one, or if there is one there already, double
click on it to expand the TOC in a new pane that opens up in the
middle.
Holler if you need more help.