Reduce Filter Queries

I am trying to understanding the differences of the versions released, anyone who can understand this particular feature please give me an example to understand. (preferably request you if you can add a screenshot in your explanation.)

 

Labs experimental features Looker 7.18 Looker 7.20 Looker 21.0 Looker 21.4 Looker 21.6 Notes
Reduce Filter Queries Supported Supported Supported  
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