Advanced Accordion Block and Select Social Icons Widget & Block are the only plugins I have installed — when I made my original post, however, there were no plugins installed. I had just updated WordPress, installed the theme and started playing around when I posted.
good news is that the code works great and the site is looking as I want it to. bad news is I modified the theme file, for the time being, to make it work (too lazy to make a child theme while I figure this out, haha).
just found this article, though, which seems to explain what I am experiencing and solution 1 worked for me! https://www.wpbeginner.com/wp-tutorials/how-to-fix-missing-theme-customizer-in-wordpress-admin/ I manually entered the URL kristinabaines.com/wp-admin/customize.php into my browser and the customizer appeared. it seems I had correctly assumed the editor replaced the customizer in the admin interface and it seems to be related to which themes were primed for the possibility of the beta editor, which, in the end, I think, is actually a good thing about this theme. I am going to go ahead and remove the code from the theme file and put it in the customizer, but I’ll save it somewhere just in case lol who knows how it will deprecate..
I suppose for my next trick, I will need to figure out how to get the beta editor to add to the style sheet because I don’t really need the customizer otherwise.