Get switch to reset to starting value

There is a switch in this activity that flips a portion of the trapezoid to a triangle so students can find the area, but when they enter an answer and get a new problem, the switch doesn’t reset.
Can I get help so that when the button for new problem is hit, the switch goes back to the trapezoid shape as the default?

I added in a ticker and an action to accomplish that. [Copy of] Area of a Trapezoid • Activity Builder by Desmos

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