Hi, the reason the outer projection of your nDisplay setup looks distorted is most likely that it is not placed in the center of your LED volume.
Try selecting your nDisplay config in the Outliner, then select the “Default View Point” component (this is part of your nDisplay config) and move it closer to the middle of your LED volume.
Once you start moving the “Default View Point” you will see how the perspective in your outer projections changes.