Use the Preview PDF tab to preview a form design as it would appear in Adobe Reader. Before previewing a form design, ensure that you have set the appropriate options in the Form Properties dialog box for previewing the specific type of form.
Note:
To preview a form in the Preview PDF tab, ensure that the Display In Browser option in Acrobat is selected. Ensure that you have the version of Acrobat installed that matches the target version saved; otherwise, you may get an error or warning message when you click the Preview PDF tab. For example, if you select Acrobat and Adobe Reader 6.0.2 as the target version for the form, ensure that you have Acrobat and Adobe Reader 6.0.2 installed.
3.
(Optional) If the form is non-interactive and being merged with data, you may also want to test the form with a sample data file to ensure that fields are appropriately mapped to the data source.
Note:
You must use Acrobat to test the Web Services and Database Connectivity features. These features require a rights-enabled PDF form, but you cannot set usage rights for a PDF form for previewing in LiveCycle Designer ES.
See also 

To preview and test forms in the Preview PDF tab