In Correlation Heatmap visuals, Arcadia Enterprise enables you to change the minimum size of the component cells of the visual.
To change the size of a cell in a visual, navigate to the Marks menu, and change the value of the Min Cell Size option. The default is 13 px, and the range is from 1 px to 500 px.
In the following example, compare the appearance of the same visual when the minimum cell size is 15, and when it is 25.