When the ‘Heat Map’ box is checked (circled below), the grid uses color gradients to visualize relationships: positive correlations appear in shades of red, while negative correlations appear in shades of blue. Hovering your mouse over any correlation value will trigger a tooltip displaying the two specific tickers associated with that value.
If you hover over an identity cell (the diagonal row of cells with values of 1.00), the tooltip will identify which tickers in the current table are the most and least correlated with that specific asset, along with their respective correlation coefficients.