The settings shown in the below image are misleading to the developer, I would expect to be able to use an R6 avatar when playing/play-testing my experience when these options are enabled.
However, unless you find and enable one of these options in the little ellipsis menu at the top then your avatar will always remain in R15, even though on the main mage you can select Player Choice or R6. This additional menu is pointless from a developer perspective and seems like its only purpose is to further prevent developers from using R6 avatars in their experiences.
I came across this by chance, because one of my friends was struggling to enable R6 in their experience. After being invited to studio, it took me a good 10 minutes to even find the little ellipsis menu and enable the setting.

