Hi, @Daniel Růžička ,
The feature Microsoft Search: Custom verticals and refiners is still in development. The process showed in the video is a demo. The private preview program is closed for now. MS would be initiating roll out to Targeted Release channel by early March. According to the roadmap, it is still in target release for Select people. For tenants I am using in target release ring, the feature has not been deployed yet.
For any questions, please reach out to the staff at microsoftsearchcustomisationfeedback@abdou .microsoft.com.
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