Sets the amount of information that is visible in a window or dialog box.
Different parts of a dialog box or window can be hidden by setting this property. The available options are:
Standard displays the field on the page by default.
Promoted displays the field on the page and also in the header of the FastTab when the FastTab is collapsed.
Additional hides the field by default. On a FastTab, to show the field, a user can choose Actions, and then choose Show more fields.
You can set the Importance property if you are an administrator or as a user personalization option.