What is a common use case for the "Set field display type" action?

The "Set field display type" action is commonly used to disable a field that isn't relevant to the current record type. This action helps improve user experience by hiding or disabling fields that do not apply in a particular context, thereby reducing confusion and ensuring that users only interact with relevant information. Disabling a field can prevent data entry or modifications that may not be appropriate or necessary, streamlining the user interface and focusing attention on critical fields based on the record's specific needs.

While modifying field relationships is related to how fields interact with one another, defining a new field in the form layout involves creating new fields rather than adjusting existing ones. Similarly, permanently removing a field from a record is a different action, as it involves deletion rather than simply altering its display type. Thus, disabling fields that are not applicable at a given moment is a practical application of this action.