and when viewed on a phone or other small viewport the top menu and side navigation do not collapse into a hamburger menu or anything like that. Is there something I’m missing about the theme, or will I need to build in the responsiveness myself?
The theme wasn’t built with a hamburger menu, but that horizontal menu should wrap lines at smaller resolutions. It seems that style was removed at some point. I’ll do a fix that will address that in the next release.
It collides with the page content text at smaller viewports. Again, it’s something I can fix but you might want to take a look at it for the theme as a whole.