The form preview displays "as the members will see it".
If you have unticked "viewable by member" for a form field, it will not display in the form preview.
If you have made a question a sub-question of a radio button or multi-radio button field, then the sub-question will only be viewable if Yes is selected as the answer to the radio button question. The form preview is interactive. You can click on Yes to view the sub-questions.
