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All charts that have the ability to show you when a value has breached a configured Limit provide a property on the measure to choose the respective Limit.
If you cannot find your Limit in the dropdown list, confirm that the Limit has indeed been added to the measure. If it has, close and re-open the Chart Configuration Editor and try again.
Once a Limit has been configured, you also need to tell the Flow Server to actually do something when it find a measure value with an Exception. Usually, you want to change the color of the value. This is done by adding a "Limit Color Provider" by right-clicking on the Color Property, then Add > Limit Color Provider
See the following article: