Previewing a form that you are working on enables you to see how it will be presented to the user without having to run the process.
For a quick preview of a form, click Preview in the coolbar. This displays the form in your default browser with the default look & feel.
To preview a form, specifying the browser or look & feel to be used, go to the Details panel, Preview tab. In this tab, you can select the browser from those available in your system. You can also choose the application look & feel.