A while ago we added the feature of being able to see the first 15 groups in your account when adding a contact, so you could attach them to more than one group at once.
Due to a request from a customer you can now select to see all your groups if you have more than 15 and your most recently used groups are shown at the top of the list, which makes adding contacts a little bit easier.
If you have any queries or suggestions on how we can further improve our service to you, please don't hesitate to contact the support team.