There is no inbuilt option in Office web app to remove the header toolbar. The ribbon can only be minimized and the toolbar cannot be removed or hidden.
Although this feature is not currently available in our Web Apps version of the product, Microsoft is committed to continuously improving your experience with our products. Please
take a moment to send us your feature request(s) by submitting your feedback directly from the
File menu inside of the Web App, going to
Help and then clicking on
Give Feedback to Microsoft. Our product team will review your suggestion(s) and consider them for future versions of our products.
Hope the information provided is helpful. If you have any other Office related issue, post in Microsoft Community and we are happy to help you.
Thank you.
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