default_filter is defined, it will only apply to new queries. The filter will not be added to existing queries.
Refer to the Filters documentation for filter operator syntax and examples.
Syntax
Properties
object
required
A map of field references to filter conditions.
Behavior
If adefault_filter entry sets required: true and a query omits the field, or a user clears the filter’s value, Omni substitutes the declared default back in.
This substitution also applies to queries that were saved before the filter became required. Their saved filter list won’t show the required filter until the query is resaved, but Omni still applies the default when the query runs.

