Make a specific Custom Post Types remain active

I have a subnav that contains only CPT’s. Each item on the subnav is a link to a specific CPT overview post using WP’s menu admin.

If the user clicks on one of the CPT overview links, can that directory remain active even if they then navigate to a different post within the CPT? The CPT’s are not built hierarchical which is why I’m wondering if this is even possible.

I saw this post: but I’m not looking to remove the active class from a different post type.

I believe @Foxaii’s nav_rejig branch addresses issues like this but I haven’t investigated it myself.

The answer would probably be in the nav.php file, correct?

That’s right. Check out @Foxaii’s branch too and see how he does it.