I'm Getting Started, Slideshow Project

All right, I’m about to start the new project on my desktop… more screen size, more power, Windows allows ordering based on photo taken date so I can import that way too. Lots of advantages now.

I still am unsure about the Video Mode. Does the Video Mode setting have any relation to exporting to a final video file? As I said above, I would like the preview video to be 16:9 proportions so that I can choose the best pan/zoom settings for my different proportioned photos, but I don’t really care about preview quality apart from that. I plan to export to 1080p, and perhaps also UHD for watching on TVs. I just want to make sure I don’t limit quality for the final output. What should I set the video mode to?