What parameter specifies a default value for filter and parameter fields?

The parameter that specifies a default value for filter and parameter fields is known as default_value. This parameter enables developers to define a specific value that will be applied to the filter or parameter when the user first interacts with the Looker dashboard or explores the data. By setting a default value, it ensures that a predetermined context is established, streamlining the user experience and guiding data exploration.

In practice, using the default_value parameter is essential for enhancing the usability of dashboards, as it can help frame the data within a certain perspective that may be most relevant for users. This becomes especially important in scenarios where users might not have the expertise to configure the filters or would benefit from starting with a common or recommended value that reflects typical conditions.

Using default_value effectively can lead to more meaningful initial insights, making it an important feature within LookML for data developers to understand and implement in their projects.