Default color palette for hierarchical clustering

[#1]

Somehow I have changed the default color palette for changing the colors of the clusters. How can I adjust the color palette used in hierarchical clustering?

I am using this to teach a class and display geographical clustering using latitude and longitude for the San Francisco Crime dataset. For whatever palette got chosen there isn't enough of a difference in the colors between the clusters to effectively display the changes in cluster size as you change the number of clusters.

[#2 · Accepted solution]

I assume the color pallet is coming from the Preferences...…
File==>Preferences==>Graphs

[#3]

Thank you very much, that did fix my problem. I had selected Viridis at some point and when you have a categorical variable with only two categories, the colors were too similar. I was able to select another sequence of colors for categorical variables.