Maybe it's as designed, but I don't like it because it makes me change things more often. I call BUG.
Changing the resources to search in the Basic Search changes the versions to search in the Bible search settings, and vice versa. Please don't link them.
Open Basic search (Entire library selected):

Change to Bible search (Top Bibles selected):

Select ESV instead of Top Bibles:

Change back to Basic search:

Only ESV is selected now.
I can't see why this behavior would be desired--when I'm doing a basic search, I'm probably NOT going to be searching bibles.