Glass tables can display static images and text, the results of ad-hoc searches, and security metrics. Security metrics are visualizations that show the values of KPIs, service health scores, or notable events. You can add security metrics to a glass table by using the Security Metrics menu in the glass table editor. You can also configure the appearance, behavior, and drilldown options of the security metrics. Glass tables cannot display lookup searches, summarized data, or metrics store searches directly, although you can use these types of searches as data sources for ad-hoc searches and then display the results on a glass table. References =

Add security metrics to a glass table in Splunk Enterprise Security

Create and manage glass tables in Splunk Enterprise Security