Mobile menu doesn’t display

I am running my site at https://www.fifthestate.org/ on a child theme.

I am posting my request for help here because I have had no responses to a similar posting to the forum of my parent theme’s developer.

At this time I am not able to display the mobile menu, even though I have the standard header menu working in desktop view.

I have tried disabling all plugins and that didn’t help.

If I run the site on my parent theme the mobile menu displays normally.

If I go to Appearance > Menus > Locations and un-select the menu (selecting no menu), the site still displays a header menu which is an old version and still doesn’t display the mobile menu.

Here is what Element Inspector shows for the old menu:

CSS selector: .menu

CSS path:
html.js.flexbox.canvas.canvastext.webgl.touch.geolocation.postmessage.no-websqldatabase.indexeddb.hashchange.history.draganddrop.websockets.rgba.hsla.multiplebgs.backgroundsize.borderimage.borderradius.boxshadow.textshadow.opacity.cssanimations.csscolumns.cssgradients.no-cssreflections.csstransforms.csstransforms3d.csstransitions.fontface.generatedcontent.video.audio.localstorage.sessionstorage.webworkers.applicationcache.svg.inlinesvg.smil.svgclippaths body.home.page-template.page-template-full-width-page.page-template-full-width-page-php.page.page-id-479.logged-in.admin-bar.custom-background.responsive.default-layout.customize-support div#container.hfeed div#header ul.menu

X path

/html/body/div[2]/div[1]/ul

I have seen recommendations to check a box in Appearance > Menus to make the menu “primary” but I don’t see that checkbox in my admin interface.

I will be really grateful if any of you can help me straighten this out.

Robby Barnes

The page I need help with: [log in to see the link]