Hello Anup,
I appreciate you taking the time to reach out regarding the volume button in Storyline 3.
This change was intentional and changed on April 13, 2021, in Build 3.12.24693.0.
- Player controls follow a more intuitive navigation order similar to popular video-streaming sites. Learn more about accessible player controls.
We do have an open feature request for the ability to customize built-in player controls, so I've added this conversation to the report. I wanted to share some information about how we manage these feature requests, which may be helpful.