There is no general way to disable all trends in interface charts. However, when you are disabling trend in a chart, you are disabling it for a view and not for net object. In other words, when you disable trend for i.e. Percent Utilization Chart on one interface, it will be set in the same way for all interfaces you are displaying with using of the same view. By default it is Interface Details View. So, you don’t need to change the settings for all charts but only for all charts in the view.