Changing App Views
This was arguably one of the least discoverable features in prior versions of watchOS, since it required a Force Touch on the actual app list or grid view, while many expected that it would instead be something that you could tweak in the main Apple Watch Settings app.
So this is exactly where Apple has put it now — in a new App View section of the Settings app. This does mean that you won’t be able to change it on the fly nearly as easily as you could before, but we don’t suspect many people did that often.