Hi @S.P Singh
Thank you for posting your question in the Microsoft Q&A forum.
I understand this is a feature will be very convenient for you and your colleagues.
Unfortunately, it is not possible to enable Track Changes globally for all documents across an entire tenant in SharePoint Embedded Office Viewer. The Track Changes feature in Office documents must be manually enabled by users on a per-document basis, with options like Off, For Everyone, and Just Mine.
If this is a helpful feature to you and everyone in the community, I recommend you raise your feedback to Microsoft via Microsoft Feedback Portal
They will listen to your ideas and consider making it a feature in the future.
I hope this information helps.
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