When I group by regarding I cannot create a new row for an item not already grouped.
Example: I have items 1,2,3.
Items 1,2 each have rows where they are tagged in “regarding”. The “regarding” grouping view will show items with 1 and 2, but not 3. This is expected. From this view I should be able to create a new row and select item 3, which would then show in its own grouping. Currently I cannot do that. I can only add rows to group 1, and group 2, but cannot create a new group for 3 without going into an ungrouped view and then back.
Hello @drkhan, welcome to the community!
To be honest, it’s a bit difficult for me to visualize this situation, and I also can’t be quite sure what kind of field ‘Regarding’ is in your case, which is going to be essential to figure out the problem. 
Would you mind writing to our chat support (it’s the chat bubble at the bottom right corner of the tool) and explaining the problem? They will probably ask for a screenshot which will give them a much better idea of the issue, and so we’ll be able to figure out if it’s a bug or something else. Thank you!