Hmm.
When i was DM i always rolled passive skills like perception in secret behind my little DM screen.
So i guess a toggle would be appropriate.
These rolls also stand in for active perception, insight, etc rolls that the party might want to make, I think, given we don’t have any other way to make such rolls except in dialogue. Not that that’s a reason not to make it a toggle, just something to bear in mind when considering what impact not showing that these rolls have happened unless they succeed might have on player experience.