About previewing and testing forms
When designing a form, you can use the Preview Form feature to test the functionality and appearance of your form before you make it available for users to fill out. Previewing and testing your form allows you to see and work with the form from your user's perspective.
Note Unlike the Print Preview feature, which only provides a static image of the form, Preview Form is interactive and provides a simple way for you to test your form without leaving design mode.
When you click Preview Form on the Standard toolbar, your form opens in a new window. In this new window you can test your form by entering data into controls to check various features, such as text formatting, conditional formatting, and data validation. This allows you to identify mistakes in the previewing window, and then quickly switch to the designing window where you can correct them.
Note To help you identify which window you are in when you are previewing a form, Preview will appear in the window's title bar instead of Design, which appears when you are in design mode.
In addition to previewing a form, you can also use sample data to quickly test the appearance of your form. Sample data is placeholder text that appears in controls on your form, and it provides an example of how text will appear in the control when a user fills it out. Sample data can only be seen in design mode and is not visible when you preview or fill out a form.