enables you to change the form display in a single view or across multiple views. Any change to the base objects is applied to objects in the view overlay while preserving customizations during upgrade.
The field that needs customization to its display properties must be added to the view overlay. Adding a field to a view's overlay enables you to change its display properties such as color, label, highlighting, and length.
The other fields in the form view are not part of the view overlay and continue to retain the base properties. This functionality of view overlay is beneficial during upgrades. When you upgrade an application, the fields that are not included in a view overlay inherit the base properties. Customization to fields are preserved during an upgrade.