Hi I’m tryng to setup a theme with a left navigation menu, I’ve found the documentation link on the official theme page but it point on the same page. How to use the left bar on this theme?

Thanks

I need to add a small mega menu to the books page and not all the categories can be seen with the normal sub menu, as can been seen on other pages. I have tried reducing the line width and text of the submenu but it just shows at the same size. If it showed at the reduced size it would fit.