RH 2020 - having both top navigation and the good old left navigation

I am trying out RH 2020 trial version. I chose the layout with the top navigation. It works very well for topics that need immediate attention. However, is it possible to still show the existing elaborate ToC on the left, on demand, or on click or something.

For example, I have 4 things in the top navigation:

Help | FAQs | KBs | Videos | Release Notes

When I click Help, can I show the left navigation? The rest of the 3 work great in the top navigation.