I'd like to suggest clarifying the wording in the box under Settings, namely in Settings/NDI.

It took me (too) long to pinpoint why my stream had a video delay;
it turned out, I picked my delay input as the Output under 1. Output, which I did because I needed it as NDI on our Led wall in the arena.

I realized (too) late that 1. Output refers to the live stream, and that it should normally be left at 'Output' and not be set to a specific input.

Somehow, a (much) clearer link between the term 1. Output and that being essentially the streaming output seems desirable.

While we're at it ... maybe also reconsider the terms External and External 2, I am totally confused by what they do, let alone their 4 checkboxes (vMix video / streaming etc.).

It feels like we just have too many terms, all referring to some kind of output:
- output
- full screen
- external (if i click on the cog for External in the lower bar, I get Output/NDI and! External)
- stream

Thanks for considering this input & keep up the very very very good work guys !

I just saw that at the very right, there is a 'description' that indicates that 1. Output is used for the stream.

And as so often before Guillaume, you are right ;-)
Still, as you probably understand, in practice sometimes there is not enough time (or rather, alertness of mind) to search through the manual, so I still promote improving the wording of '1. Output'.
Specifically, putting the description that is now on the right in a light font, at the left in a bold font would clear up the possible confusion instantly.