The button to add items to a match group is beside the icon to dissolve a match group, this is going to be very frustrating. The dissolve button should be moved over to the right where the trash icon (remove item button currently) and that remove icon moved next to the add icon
We are already tracking this as part of the backlog.
I agree that the Add and remove items buttons should be next to each other as they are similar functions and it is a bit confusing having to next to the dissolve icon. These are also (at least in the current version) rarely used.