How to remove folder/bin from inside main bin in Project Panel

I'm still pretty new at learning the functionality of Premiere. I'm using PPcc 2018. I want to remove all the sub-bins from inside the main bin titled "Opening Sequence". I somehow managed to create a bin in the Project Panel and then include all my other bins/folders inside the main one. (see screenshot). I would then be left with separate bins titled "Opening Sequence", "Cutaways", etc without them being tucked inside the main bin.