Signals Notebook: Advanced Search available Search filter fields

By default, Signals Notebook shows Search Filter fields  that are used by existing active collections in the tenant  . If you want to see all available Search Filter fields, you will need to enable it by clicking on 'Show all values' checkbox.

Search > Select a filter > click on the title of a Filter type > check 'Show all values' checkbox

Please, refer the screens below as an example: