For the power chart, do you have to have history configured on the chart? Or can it plot from the point in time you loaded the screen/view?
So if you specifiy the last 10 seconds, it will start overriding itself after 10 seconds worth data.
You must have the historian. Ignition doesn’t have any builtin ability to do a ‘local’ value trend. There are some third-party modules/efforts to do so in Vision, I believe, but I don’t think anyone’s done so in Perspective (yet?).