When building your scenario it is possible to build it "Facilitated" or "Self-Paced".

With this option, there will be a moderator running the experience from his or her own dashboard. Injects in the facilitator dashboard determine when content is published to the players. These injects are sent from the Exercise Control to the facilitator.

There isn't a facilitator sending injects or moderating the exercise - this means each player proceeds at their own pace with th exercise advancing based on decisions they make.

To change this go to your scenario configuration (Scenario > Configure...) or to your Default Settings (Click on the gear icon at the top).