Contacts as default rather than Recent
The new contact list is a great addition and I believe that for some it will be used more than the recent conversations tab. So I think an option to set it as default or having Teams remember which one was used last would be a good idea.
Mark Niles commented
It would really be great if they found a way to bring CONTACTS and RECENT tabs into one. Contacts at the top and recent below it.
Otherwise you end up bouncing between the two tabs (Recent & Contact) Many times your contacts are also in your recent so you end up having duplicated conversations threads on either view.
Sean Ellis commented
The state of your UI should be much more configurable, and it should remember the state between invocations.