The main menu displays on desktop and mobile, and on mobile it correctly changes to be a mobile menu version (box that says "Menu" with an icon, rather than the horizontal menu that displays on the desktop version).
However, I would like to display a different menu to mobile viewers, to replace the desktop Main Menu. I created a menu called Mobile Menu and assigned it to module position hornav_mobile, and added the menu id tag "mobile" (without " "

I suspect that I don't really understand the differences between the hornav menu and the slicknav menu... I took a look at the responsive.css and the responsive_nav.css but didn't see anything that indicated how to change the menu associated with mobile version vs. desktop version.
Thanks in advance for your help!
Lowell