Hi Ken and Deb,
I am Dave, I will help you with this.
The new Navigation pane in the new Tabbed File Explorer is very minimalistic, currently the only option to make the navigation pane look like the old version, is to right click an empty spot in the left navigation pane and turn on 'Show All Folders'
Also, please open the Feedback Hub (Windows Key + F) and provide your opinion on the new File Explorer to the developers there, many people have done that and hopefully they will make the necessary adjustments in the next update to the new File Explorer app.