making top level pages appear as links in sidebar menu

I’m refining my first wordpress site using Natural Theme and have sub-domain headings listed in the right column as links so that people can navigate among the subpages without going back to the toolbar.

My website is https://www.leemfaver.com

I’d like the top level name, in this case, “Therapy,” that appears in the toolbar, to be listed as a live link in that right column along with the three subpages. Since a viewer can navigate to the subpages directly from the toolbar drop down menu, it’s possible people will bypass the content on that top level without realizing it exists.

That right column would include the following all as active internal links:
“Therapy—Embracing life and overcoming obstacles”
>>”Approach to therapy”
>>”Areas of Expertise”
>>”Therapy Services”

Currently only the three subpages are links. Can anyone tell me how to accomplish my goal?
Lee Faver