I've been looking through the SCM settings for the Full Screen mode Scenes but I've not been able to figure out why Bikinis, Halloween, Whisper Club and Xmas appear as a centralised 16:9 on my 21:9 monitor, i.e. black bars to the left and right, but all others are all the way to the left, i.e. a single black bar on the right side.

I was hopeful there might be a simple tweak to the SCM to correct. Has anyone figured this out?

I think I may have answered my own question. The scenes that work appear to have a 3d camera. Seems 2d cameras don't auto centre themselves on the display.