I mean to say if I rollout to 20% users, does that mean only 20% of the first time installers will see the new version and 80% of first time installers will see the old one?
does that mean only 20% of the first time installers will see the new version nd 80% of first time i stallers will see the old one?
That 20% includes the first time (new) and also the existing users. There is no differentiation between the new users and the existing users.
From the doc:
New and existing users are eligible to receive updates from staged rollouts and are chosen at random for each new release rollout.