You can use this package to set the user interface defaults associated with a table within a schema. The package must be called from within the schema that owns the table you are updating.
User interface defaults enable you to assign default user interface properties to a table, column, or view within a specified schema. When you create a form or report using a wizard, the wizard uses this information to create default values for region and item properties. Utilizing user interface defaults can save valuable development time and has the added benefit of providing consistency across multiple pages in an application.
"Managing User Interface Defaults" in Oracle Application Express SQL Workshop Guide