If a setting is changed for the displayed plot-type, how are the curves in the plot updated/refreshed?

Curves that are already plotted may be refreshed automatically or manually, this is set from Plot->Auto-Refresh… and is shown below:

If Auto Refresh is not checked, the plotted curves must be updated manually. Do this from Plot->Refresh… or the  button on the Standard toolbar.

If  is selected, the curve belonging to the active measurement will be updated automatically if any changes in settings are being made.

If  is selected, all curves are updated automatically if any changes in settings are made.

Auto-refresh can also be turned on/off using the  button on the Layout toolbar.