Hello,
Have you tried to contact the support of plugin first?
1/ Add the next code in Theme Options > Theme custom CSS > Mobile:
.woocommerce-checkout .form-row-last {padding-right: 0px !important;}
.woocommerce-checkout .form-row-first {padding-left: 0px !important;}
2/ Provide a screenshot for a better understanding of the desired result.
Regards