Hey ​@Sankalp Dubey , thanks for reaching out to the community.

In order to remove the extra annual seat, you can follow these steps:

1. From the file browser, go to your Professional team in the sidebar and click Admin.
2. Select the Settings tab at the top of the page.
3. In Plan and billing section, select Add additional seats:
4. Figma will show you the total number of full seats included in your subscription and the total Subscription cost.
5. Add more seats to your annual plan if you plan on adding or removing collaborators.
6. Enter the updated number in the field. Click outside of the field to apply.
7. Click the Accept terms and upgrade button to complete the process.
8. Figma will update the number of paid seats included in your annual plan. You won't be charged until your actual annual billing date.

For more information, you can check this help center article: Add, manage, or renew annual subscriptions
Hope this helps!