It took some experimentation to determine that the Boolean field named "Report Types” actually means “If true, this is a report marked as Quick Insight":

The inconsistent naming makes the system less intuitive. Compounding this, the current documentation
(https://support.gainsight.com/gainsight_nxt/Reports_and_Dashboards/About/Reports_and_Dashboards_New_Functionalities_and_Improvements_(Horizon_Experience),https://support.gainsight.com/gainsight_nxt/AI_Bot/Sally/Sally_for_Slack/Admin_Guides/Mark_Reports_as_Quick_Insights), does not mention the "Report Types" filter either:

Bottom line: even if updating the docs takes time, having consistent names would be a big win for making things more intuitive and less of a guessing game for us users.