In addition to the formatting options common to all objects, and to some of those common to all plots, Heat Maps have certain properties, such as Heat Map Overlays, Color Levels and other specific options which can be formatted.

 

You can format an heat Map by right-clicking on it, selecting Format from the pop-up menu, and choosing a category. This method will allow you to use the Preview button to see what the changes would look like without accepting the changes and allowing you to revert. Alternatively, once the Heat Map is selected, you can choose the desired category from the Format tab of the Ribbon.