Unfortunately, it is not possible to remove existing sessions. However, you can easily edit or update them by following these steps:

1. Go to the "Academic Session" section within the "Masters" module.
2. Look for the session you wish to update and click on the pencil icon next to it.
3. On the next page, you will be able to change the session year, start date, and end date according to your requirements.
4. After making the necessary changes, click on the "Submit" button to save your updates.

Please note that existing sessions cannot be removed, but you have the flexibility to modify them as needed.