Hello @emolotel
The fonts and colors (or any other design modification) are defined with CSS (the new styles should be redefined through the “Customize Form Design” attribute in the “Form Settings” tab: https://cff.dwbooster.com/images/documentation/form-settings-tab.png), and the styles to define depends on the elements you want to edit.
For example, assuming you want to edite the appearance of the calculated fields, you can enter the following style definition into the “Customize Form Design” attribute:
#fbuilder .cff-calculated-field input{
font-family: Arial, Helvetica, sans-serif !important;
color: red !important;
}
Of course, using the CSS rules and values you want.
Best regards.