How can I get my form size to match my mobile website page the same as when you launch a form?

Do you want to display the form in the same mobile size on laptop as well? You need to reduce the width of the form. Please check the screenshot below:

After changing the width of the form, if you want the fields also to be displayed in full width, please inject the following custom CSS code in your form:

.form-label {

    width: 150px !important;

}

.form-input, .form-textbox {

    width: 100% !important;

    max-width: none !important;

}

The following guide should help you how to inject custom CSS code in form: https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

Do get back to us if you have any questions.