A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi Ramanpreet Kaurr,
Thanks for visiting Microsoft Community.
In Excel, setting "Automatic Data conversions" is an exclusive feature for Microsoft 365 subscribers. This feature is not included in Office 2021 Home and Student.
Please refer to the official article: Set automatic data conversions - Microsoft Support
The reason you can see this setting is that the current Office login has been used by a user with a Microsoft 365 subscription. If you have a Microsoft 365 subscription or an account that includes a subscription, you can switch licenses or accounts in Excel by clicking on File, then Account, and then selecting the option to switch to an account that includes a subscription.
If you have any further questions, feel free to reply to me.
Best Regards,
Jonathan Z - MSFT | Microsoft Community Support Specialist