Fair warning: I’m a bit of a WordPress novice, so this may not be the MOST helpful, or even accurate, but it worked for me.
This theme seems to have a lot of hardcoded widgets, which is unfortunate. They’re also in the PHP files marked “Sidebar”, which is confusing, since they’re footer widgets.
With a child theme, I was able to edit the files: sidebar-home.php and sidebar-archive.php to remove the “widgets” in question.
Toward the end of both of these files there are a number of blocks of code that begin with something like
<aside id=”recent-posts” class=”widget”>
…lots of code…
</aside>
If you delete the chunk of code from <aside id…> to </aside> the widget goes away, yay!
These funky built-in widgets are my least favorite element of this otherwise nice theme.