For more information about the Defence Formations, how to access and the mechanics check out this thread:
[Master] 🛡 Alternate Defence / Raid Formations -- Feedback & Discussion Thread (Polls in post #2)
Some basic Feedback Polls have been set-up in Comment #2 (here) but also share your thoughts, feelings and opinions about this new feature.
So head over there to join the discussion! As always, the #forum-rules apply.
Happy Gaming!