Make sure the chart is visible, click on its title on the left of the chart and then remove it with the trash bin icon.
I did notice that for some trace(s), there is a problem. Distance for example, doesn’t show a title and you can’t click on anything to pop up the edit dialog. Untill you make a selection and then the distance is indicated at the place of the chart title. Click on that to pop-up the edit dialog.
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