Adding trendlines to multi-series line charts

Crystal Reports - adding a trendline to a multi-series line chart

I have a multi-series line chart (example attached) that I want to add trendlines to.  I have set the setting to add the trendlines but my graph doesn't change

Am I doing something wrong?
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What are you expecting to see?

sffuser2Author Commented:
I've added trendlines to bar charts (as attached), so wanting the same but for the line chart
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