Please confirm once the missing the options in sotyline in latest update. Where we need to find this missing options in latest version of storyline360?

Hi, Eswarkumar.

Thank you for reaching out!

You can read more about the new Slide Size options in the article below:

• Storyline 360: Default Slide Size

While it looks like the options under If new size is larger are missing, they actually work through the checkbox at the bottom that says Scale existing content to fit. If the checkbox is unchecked, the position will default to the center. 

I hope this helps!