Dear Ravi,
Thanks for your updates.
Yes, I have the Style feature in my tenant now. It seems that the feature hasn't releases to your tenant. As the targeted release users may get the latest feature in a tenant first, I suggest you try enabling some users in your tenant as the targeted release users to see if they can get the feature in Microsoft Forms. If yes, the feature may be being released to all tenants and you may keep close eyes on the latest updates of your tenant to get the feature.
Set up the Standard or Targeted release options - Microsoft 365 admin | Microsoft Learn
If no, the feature is automatically released and we may have limited permission on helping you fix the issue in your environment. The next step may be to open a support ticket to our related team and they may help you fix the issue in your environment directly.
I suggest you contact the administrator in your organization if you aren't the administrator and let him follow the steps in the following article to open a support ticket to our related team as soon as possible.
Get support - Microsoft 365 admin | Microsoft Learn
Sorry for that our category may have limited resources to contact the related team directly.
Thanks for your understanding and hope that the issue in your environment can be soon fixed!
Sincerely,
Cliff | Microsoft Community Moderator