Hello action bar not showing

Are you talking about a 'playbar'? Terminology is always a problem, maybe post a screenshot of what you label as a 'action bar'.

I am not sure, but it looks like this slide is from one of the Quick Start Projects. Can you confirm if it is the case, and if yes, tell which Project and which Slide you used? It is possible that the 'disappearance' of the bar has been set up in this slide. If it is a playbar you talk about, know that there is an action 'Hide Playbar' which could have been triggered by the On Enter slide event.