Inspect the receiver’s picture
Keep a visible rehearsal label in the intended audience composition and inspect the application receiving the virtual camera. Record whether it shows that composition, an unfinished preview or a physical webcam. The receiver’s selected input matters as much as the OBS screen.
Read the virtual camera policy
OBS documents Preview as an available Virtual Camera output and explicitly says viewers can see scene changes and edits there. If the audience should follow the produced output instead, inspect the intended Program policy. For a stable visual aid, a fixed scene may suit the task.
Make the change during a harmless rehearsal. Perform one deliberate preview edit that should remain outside the audience feed under the selected policy. Check the receiver directly instead of assuming that a successful button press changed its picture.
Retain the chosen behavior
Write the camera policy and receiving app together in the presentation note. Another operator may otherwise restore a preview route because it happens to contain the right image at setup time. Recheck framing in the receiver before the next actual session.
This article does not report a meeting or camera test. It explains a documented output choice and provides a focused way to inspect its consequence.
Questions answered
Can Preview be an intentional virtual camera output?
Yes. It is useful when preparation itself should be visible.
Why check the receiving app too?
It may have selected another camera or applied its own layout.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.