Some users might feel that not enough data is shown in the Sales heat map. We have a few tips to help you with this issue in order for you to get the full overview and value of the heat map .
1. Only include data columns that are relevant for you report.
2. Change your zoom setting in the browser to a lower value.
3. Close the Salesforce.com panel to the left (you need to set up this feature in Setup).
Check out this video for more details about how to solve this problem.