How to clear a canvas?

I’m making a paint app with a background image to color in. I’m using the canvas and using touch drawing. I have a button that should clear the whole canvas but don’t know how to do it. How do I clear all the touch drawings off the stage?

Never mind there is a dedicated block for that. I feel dumb now…

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Can you tell me the name of the button? I’m a beginner and not aware.