I broke the nav menu search thingy on the right hand side of the nav menu!
I had installed three plugins (WP Editor, WP Live CSS Editor, and WordPress SEO by Yoast). One of them changed the magnifying glass search form to a generic search form with a text box and button. I wasn't paying enough attention to catch which plugin made the change.
The change happened in both my Tiny Forge parent theme and child theme.
I deactivated and deleted all three plugins. I deleted and reinstalled the Tiny Forge parent theme.
No luck...the old style search form is still there.