Advanced Designer vs Form Builder: the design of the form does not look the same.

when I select the advanced design builder, the form is not in the same look & feel as it was in the regular builder

Please specify what is the form where the look changes when viewing it in the Advanced Designer. We would appreciate if you could also share screenshots to illustrate what you mean: https://www.jotform.com/help/438-How-to-Post-Screenshots-to-Our-Support-Forum  

Hello BDAVID,

In the regular designer:

In the advanced designer > the boxes, fonts, buttons, etc. are different!:

Thanks for reporting. I can see the huge difference between them. 

However, when I check your custom CSS codes in the CSS tab, it does not have the CSS for the current style displayed in the form builder so I assume it was from a theme or old CSS that is not rendered in the advanced designer.

You can inject this CSS codes in the advanced form designer to fix them

.form-dropdown, .form-textbox, .form-textarea {

    width: 100% !important;

    max-width: 440px;

    border-radius : 6px;

    height : 40px;

    box-sizing:border-box;

}

[data-type="control_dropdown"] .form-input, 

[data-type="control_dropdown"] .form-input-wide {

    width: 100% !important;

    max-width: 440px;

}

Hope this helps!