Hi Sujeet Kulkarni,
Welcome to Microsoft Q&A Forum.
Thank you for reaching out regarding your email group in Outlook 365. I understand it can be a bit tricky to locate the options for editing or deleting a group, so I am happy to guide you through the process.
If You Created a Microsoft 365 Group : Edit or delete a Group in Outlook
If You Created a Personal Contact List: Create, edit, or delete a contact list (or contact group) in Outlook
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Please feel free to let me know if you have any further updates, thanks