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To submit the form without refreshing the page, you can use our Premium add-on. With the Premium add-on installed you can go to MC4WP > Forms > (your form) > Settings and turn AJAX submission on.
We also offer a plugin to make modal boxes, its’ called “Boxzilla” and works well together with MC4WP. Boxzilla has JS hooks that fire when you close the box and you can use those to add your own JS code to clear the form when the box is closed.
Hope that helps. If you have any questions, please let me know!