Captivate Software Simulation Problem in playback

That is the design of the modes:

• Demo is meant just to be watched passively, almost like a video
• Training: the learner is expected to do something on each slide. That can be clicking in a location or typing in a text. To be able to do so, you'll see on the Timeline (please make that TImeline visible) a pausing point eichter from a click box, or from a Text Entry Box. Once the learner has done that 'interaction' the simulation proceeds to the next slide. Training sim in default setting has Hint captions or shapes that appear when the mouse is near the interactive object. You can edit all text.
• Assessment is similar to Training, but no hints. The interactions are scored this time and at the end you can show a score slide with the result.

Please, read this article to understand why I insist on showing the Timeline:

Challenges for Starters - Captivate blog

You can watch this interactive movie to  learn more about the timeline:

Captivate's Timeline