I'm just guessing the layout of your data, but you should be able to create a copy of the metric on the Rows shelf and create a dual axis chart. From there you'll just need to adjust the settings in the Marks cards for that particular pill by removing the dimension for color. This should result in a single overall line. Feel free to share a workbook, if this doesn't give you what you need.
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I'm all set. Thanks! The key is to add the dual axis.