If you add properties but do not use the includeProperties attribute, new properties are automatically shown on the first tab that is displayed. When using the includedProperties attribute, new added properties will not automatically show by default. You must include the properties specifically.

To define which properties or category of properties show on a specific tab, use the ItemViewMapping AttributeValues includeProperties and includeCategories. You can also show all other undefined properties on a specific tab using the ItemViewMapping AttributeValues showNewProperties attribute.

For example:

<![CDATA[resourceBundle=AmAvSiteBnd,includedProperties=
  aMgrAvSiteCategoryeNewIncludedProps]]></set-property>
</add-item>

<add-item item-descriptor="attributeValue"
  id="aMgrAvSiteCategoryNewIncludedProps">
<set-property name="value">
  <![CDATA[siteDownURL,preOpeningURL,siteIcon]]></set-property>

The site configuration repository categorization determines the headings under which a property is displayed in a tab. If no category is set then the properties will be shown in an uncategorized category for that tab.