Hi @WAS! I am assuming you are talking about the output visualization from the diversity beta-group-significance visualizer --- check out this great thread for a bit more discussion:
If you are asking about a different visualization, can you please post the following:
the version of QIIME 2 you are running
the exact command you are running (copy and paste)
the metadata you are using (upload or copy and paste)
the resulting visualization in question (upload or attach a screenshot)