Step 2: Reveal roles privately
Pass the device to each player one at a time. Civilians see the exact word. Imposters only see the category hint. The rest of the room should not see the screen during this step, because the quality of the round depends on every role being private.
This is also where the host can set expectations: do not speak during reveal, do not joke about what you saw, and do not linger with the device longer than necessary. A clean reveal phase creates a cleaner discussion phase.