Disable the tally light effects; can be applied to both viewer or publisher.
Tally lights are represented as a glowing red border around videos. When the light is on, the video is considered "VISIBLE" within OBS Studio. This is based on whether OBS Studio tells VDO.Ninja if a video is active or not.
Videos on first-load in OBS, even if visible in OBS, don't glow red; it requires an initial visibility change to trigger it.