Try it!
Draw or sketch in OneNote to bring your notes to life.
Draw in your notebook
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Select Draw and select a Pen, Pencil, or Highlighter to use.
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Once you've selected what you want, select the downward-facing arrow.
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Select the pen's thickness.
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Select a color, or select More Colors to find a custom hue.
Turn off drawing mode
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To cancel drawing mode, press Esc.
Source: Microsoft