Thanks for the suggestion, Abinash! And Raam, thanks for digging into this a bit more!
After my post in Feb, I tried using “ShiftNav” for a bit but disabled it because I was seeing some big impacts on site performance and couldn’t tell if the Menu was the root cause. Even with that said, it does work pretty well and has a good amount of customizations but there were some weird quirks relative to the theme (i.e. when using this menu, there was a ~100px header at the top of the page to accommodate the ‘hamburger’ icon that I didn’t like) –> https://wordpress.org/plugins/shiftnav-responsive-mobile-menu/
Responsive Menu also seems to be a decent plug in that appears to work at first glance, but I have not used it yet or dug into all of it’s options/bugs/quirks to recommend it at this time. –> https://wordpress.org/plugins/responsive-menu/