This article is going to show how to scale visible rows only within the Order Heatmap.  This feature for the Order Heatmap can be used when referencing what you currently are viewing within the chart in terms of coloring the gradient, vs pulling a level 50 points up.    

The first step is to click the cog on the, "Order Heatmap" study. See below for clarification on this. 

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After you click this, a drop down window will appear and you will see the option, "Scale Visible Only". This is the option you would like to check so your heatmap can be properly scaled. See below for clarification on what this should look like.