Header won’t apply to “Front” page

I manage a site with several blogs, inculding one blog with a series of static pages stored within WP. There is a common header in which there are a number of components that apply to specific pages within the site (css, etc), and others that should apply site-wide. For nearly everything, this works great. However, recently the main user decided she wanted to use a blog portion, too. So I started setting that up but found the header wasn’t applying to that piece; it showed up as a very plain blog (ie: no CSS applied, no theme, nothing but the essential html code).

So I started playing with it (some history in this thread: https://www.ads-software.com/support/topic/396674). I found I could extract some of the code out of the if-elseif tree within the header and that applied. But anything in the if-elseif section just wouldn’t apply at all. Tried adding an -else section at the end of the if-elseif tree, no luck. Tried a number of other convolutions of the if-elseif construct with no luck. Switched to a case statement, no luck. Posted here and based on esmi’s advice in that thread, tried an is_home() statement, no luck.

The site in question is at https://www.riverstoneschool.org. One example of the static pages within the blog in question is https://www.riverstoneschool.org/news-events/press-awards/. The “front” page of the blog–the page on which I’d really like to get the header to apply–is https://www.riverstoneschool.org/news-events/.

Any help appreciated!