When screen sharing using “presenter mode” the entire screen on the device will be consumed by the presentation. The competitor will no longer be able to see the tournament room, including the judges. However, judges can see both the competitor and the shared screen.
Presenters using a MAC may experience difficulty screen sharing. Mac iOS requires that you enable Screen Recording on Google Chrome. To turn this on, go to your settings – Security and Privacy – Screen recording and put a checkmark beside Google Chrome.