I had created four different groups of ships ... 1 thru 4. I decided to put all those four groups in the same group; so I selected all the ships and assigned them to group #5 (CTRL+5). My expectation was that now the first 4 groups would no longer exist as groups.
After a bit I noticed that each of the original groups, #1 thru #4, still existed and still had the original ships assigned to it. That is, I now had the original 4 groups along with the 5th group which included all the first 4 grouped together.
Would someone please tell me how to UN-group or maybe UN-assign #1 thru #4?