The Draw tab is on by default for pen or touch-based computers. If you don't see the Draw tab, here's how to add it.
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Open PowerPoint > Preferences.
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Select Ribbon & Toolbar in the PowerPoint Preferences dialog box.
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On the right pane, check the box for Draw. If you don't see it, choose Draw from the left pane and select Add.
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Click Save to close Ribbon & Toolbar options.
The Draw tab is on by default to use the mouse to draw. It will work with a pen or touch if the computer supports it.