Hi @Thanu Krishnan ,
Are you using new or classic version of Outlook? You can refer to this article to check it: What version of Outlook do I have?
In new version of Outlook, to change how your email is sorted:
- At the top of the message list, select Filter.
- Select Sort and choose how you want to sort your email.
The new Outlook is not yet complete, and some options may not be available or work as expected. You can switch back to the classic Outlook at any time by clicking the toggle button in the top right corner of the window.
To learn more about the new Outlook for Windows: Getting started with the new Outlook for Windows
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