The Eject camera (and ToggleDebugCamera) do not have full look controls in the Topdown template.
1. Open a new Topdown template
3. Press Eject > Use the mouse to look around
4. Exit & PIE again
5. Hit ~ to enter the console command (ToggleDebugCamera)
6. Look around
Results: Using Eject, the camera is limited to the mouse movement within the viewport & the up & down are not registered. Using ToggleDebug Camera, the camera is limited to the mouse movement within the viewport.
Expected: To have full look controls like in any other template and QA-Game
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-15213 in the post.