Remove "Information Submitted Successfully" after submit

Hello,
When I create a form with mathematical operations, the calculation is not performed until the site visitor hits “enter” after the numbers are entered into the fields. In order to have people finish the calculation, I included a submit “calculate” button. When clicked, everything works fine except that a pop up window with “Information Submitted Successfully” appears immediately. How can I remove this pop up? It prevents from the results being properly seen as the screen turns dark grey and the pop up asks to click OK, which in turn deletes the calculated results.

Thank you.

https://ww.wp.xz.cn/plugins/smart-forms/