To create a new form based on the 'Details' application part, you should:

The best approach to create a new form based on the 'Details' application part is to click on the Application Parts button in the Create tab. This option allows users to access pre-defined application parts that are designed to simplify the form creation process by providing ready-made layouts and structures based on common data entry needs.

When you select the Application Parts button, you can find a variety of options, including the 'Details' application part. By choosing this, you can quickly incorporate standard fields and design elements specifically crafted for displaying details about records, which saves time and ensures consistency in data presentation.

The other methods, while functional in their own right, do not leverage the specificity and convenience of application parts tailored for various data management needs. The Design tab's option to create a new form allows for a blank slate that requires additional setup, while utilizing a subform wizard and copying elements from existing forms can be more complex and time-consuming without providing the same structured benefits.