




This solution comes courtesy of sabre123 from the Adobe Captivate Community forums so full credit goes to him or her.
Here is the entry you will want to search for: cp.autoplayImage.style.opacity=0.7
You might be asking yourself why your learners have to click on a playback button anyway? Due to browser updates, modern web browsers have discontinued auto-playing media in web pages. Similarly, HTML5 and responsive courses created in Captivate will not auto-play. Autoplaying is not honoured even after enabling the option Auto Play in Preferences > Project > Start and End.
https://helpx.adobe.com/captivate/kb/captivate-responsive-courses-not-autoplay-browsers.html



Is there a file, setting, or registry where you can set cp.autoplayImage.style.opacity=0.7 to =1 to default and not have to change it every time that a course gets created?