Hi Noha,
Thanks for reaching out! You are correct that the course playback speed control is available in Storyline 360 but not in Storyline 3. We'll end support for Storyline 3 on December 30, 2024, to focus our resources on Articulate 360, but if a similar feature is ever made available for Storyline 3, we'll let you know. I recommend transitioning to Storyline 360 to enjoy this feature and other benefits. Please check out this article for details on Storyline 3 End-of-Support Transition Guide.
If you require any further information, please let me know.
