Once you have created a custom preview data file, you can configure the form to use this file rather than the default file (or no file at all) for preview data.
Procedure
In the Properties view for the form, click the Preview Data tab.
Select one of the following radio buttons:
None
Select this option if you prefer that no data be displayed initially for the controls when the form is previewed.
Default
Select this option if you want to use the default data for each control on the form.
Custom
Select this option if you want to use your customized
.data.json file for the preview data values. The
Custom radio button is paired with an optionlist that shows all the
.data.json files associated with the current form. Select the custom preview data file you want to use from the optionlist.
