Returning customer#1897

I have just returned to tabletop simulator after a lengthy break. A lot appears to have changed.
I know that I had purchased Zombiecide sometime ago but when I actually and finally figured out how to log back into the simulaor I still can’t find any of the games I have purchased.
Where and how do I access the library of games I have in table top simulator. and how do I set up a single player game?

You click “create”, then “single player”