Which feature in custom forms helps keep forms more manageable by showing relevant fields or hiding irrelevant fields based on user selections?

The feature that helps keep forms more manageable by showing relevant fields or hiding irrelevant fields based on user selections is known as displays and skip logic. This functionality allows users to streamline the form-filling process by tailoring the form's content to the user's specific input. For example, if a user selects a particular option that necessitates additional information, the relevant fields can dynamically appear, while other fields that are not applicable will be hidden. This ensures that users are only presented with the information they need to provide, enhancing their experience and increasing the accuracy of the data collected.

In contrast, the other options do not serve the same purpose related to dynamic field visibility. Object type defines the kind of data structure or entity being dealt with, the field library is a repository of fields that can be used in forms but does not dictate how fields appear based on user interaction, and a calculated custom field performs mathematical or logical calculations based on values from other fields but does not manage field visibility based on user selections.