Re: How do I unregister a sidebar?
Exactly Andy. That’s my issue. Hacking the parent function.php file is easy. But I don’t want to do that. So I created a function.php file in my child theme but the unregister_sidebar() function doesn’t seem to work 
I suspect this is a WPMU thing… not a BuddyPress thing. Here is the code I added to function.php in my child theme. Should work. Doesn’t. I’m at bit of a loss. I tried adding different priority levels to add_action() and they had no effect.
<?php
function remove_sidebar() {
unregister_sidebar('third-section');
}
add_action( 'admin_init', 'remove_sidebar');
?>p.s. https://codex.wordpress.org/Function_Reference/unregister_sidebar
