Filter generator allows you to hide from your structure issues that don't pass certain criteria. You can use JQL, Text and S-JQL queries.
Once you add this generator, you will only see the items from the structure that pass the query and their parents. The parents are necessary to show the issues without breaking the hierarchy.
- All filters have an option to show not only matching issues, but also all their descendant. Select the Show all sub-items of matching items option in the generator settings to enable this.
- JLQ Filter has an option that allows you to keep non-issues as you apply the filter. Since the folders and other types of items are not returned by the JQL, this is the only way to tell the filter not to remove them.