IDE is designated using the

1) Study Configuration application 

2) Click on the Functionality tab

3) Check the Use Interval Date Entry CheckBox

4) Save Study Configuration

Which forms use IDE depends on the designer of the study. Using the Form/Page Properties, the Study Designer can determine if a given form is to use IDE by clicking the Interval Date Entry checkbox in the Data Section. 

The figure below illustrates how to include a given form in IDE.

Click Here to Learn How to Use IDE