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Go to the teams Group.
Click on the + Icon that is highlighted in the below image.
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When you click on the + Icon, you will receive Pop-up
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Click on OneNote.
Give it a name and Click on Save as in the below image.
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To toggle between new page and section click on the highlighted Icon the left.
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To access the OneNote in Desktop on in the browser click on the Editing Icon in the right corner.
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To access the Complete Menu ribbon click on the dropdown list that is highlighted in the below image.
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To access the Font Setting click on the home icon as highlighted.
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To insert any file or tables click on the Insert Option that is highlighted in the below image.
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