This is part of Ancestry's ProTools, and is being rolled out slowly, so you may not have it yet.
1. Ross Curtis (AncestryDNA geneticist) – “Science of: Matches by Cluster” https://support.ancestry.com/s/article/Science-of-Matches-by-Cluster
2. Angie Bush (ProGenealogists) – “DNA Matches by Cluster” https://www.ancestry.com/c/ancestry-blog/dna/dna-matches-by-cluster
3. Jarrett Ross (Geneavlogger) – “How Does Ancestry's New DNA Cluster Tool Work?” https://www.youtube.com/watch?v=jzcjI59F6YI
4. Dana Leeds (Genealogy with Dana Leeds) – “Ancestry’s DNA Clusters: How to Read Them and What Gray Cells Really Mean” https://youtu.be/AXZzmULj-o8?si=ptJ9vh3EOA4Wnccg
