Hope everything is well! Just wanted to check in to see if you are still encountering this behavior. I am wondering if the reason the ‘no confirmation’ option does not pop up for Rishi_Palanikumar because you are not able to an existing but can do so for creating a new schedule. I would definitely try creating a new one to see if that is the case and make sure that option appears for you.
However, I also found a previous thread listed here that indicates that despite the option being available, it still may not work as intended. I will make sure to keep this post marked as a Feature Request to promote further awareness to the AWS Team, but please feel free to let me know how creating a new schedule works for you in the meantime!