I use v. 6.9.6-stable, am having some strange behaviour:
I can suddenly no longer prevent my collections from appearing in the front office list.
(After I choose something else and save (apparently succesfully) the bullet point is back in public ?)
What do you need for debugging, if it is a bug that is ?
There is a fix available in github but it will be included in b2evo 6.9.7, ti be released in a couple of days.