Is this currently an existing feature request?
No.
Wishlist item
If I have 6 collections, 3 of them related to products and 3 of them user data, I would like to be able to group the collections.
Right now, the collections are sorted alphabetically, which is fine, but it would be nice to be able to group them as needed.
What current pain point are you facing?
Searching for internal collections vs product collections vs user generated collections is cumbersome. Different departments create their own collections and the combined collection interface seems pretty haphazard.
Do you have a current workaround that you’re using?
I don’t think there is a way to organize the list of collections.
Describe the feature you need and how it would work. (Bonus points for mockups 
)
We would be able to group multiple collections together. This is just a visual improvement and would not affect the working of the collections or the CMS in any way.
How will this impact you?
This will make it easier for different teams to maintain their own subsection of collections and differentiate between various categories of collections.