If you want to change the checkbox value programmatically you need to create variables of type boolean that will store the value.
For example:
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create a variable for the first checkbox
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set the checkbox initial value to the variable
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add a workflow that updates the variable when the checkbox value is changed by the user
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now you can reset the checkbox value with any workflow by using a “change value” action. For example I am using a button to trigger the reset
This is the result: