Trendline - fit to chart

Hi all
I have added a trendline to a bar chart in WAD, but my chart resizes itself to fit the bar chart and not the trendline.  I am projecting the trendline for the 6 months but disappears from the chart after two months (due to the rate of increase).  I cannot find a way to force the chart to resize axis according to trendline, can anyone point me to the correct setting (if it exists)
Thanks in advance
Simon

Check the sample application

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