It leverages the sidebar excellently. We used to have a plugin that functioned similarly in the past, but it only added the docs tree to the header. The sidebar is much better suited for this purpose.
From a UX standpoint, it’s working well. The only thing I’m missing is a complete “tree” in the sidebar.
Currently, there is no option to navigate between “main” documentation categories in the sidebar or return to the root level.
If you switch to, for example, “General Usage,” you should have the ability to navigate up to the root level (Documentation). Perhaps a link like ← Back to Documentation Main could be included below ← Back to Forum.
In general, I believe that two levels of tree categories are sufficient, and it would be wonderful if the sidebar could support both levels.