Make sure one of the time domain plot types is displayed, e.g. Time Data (Impulse Response). Note also that if changing the filter settings for the Time Data (Impulse Response) plot type, the time domain plot types Step response, Energy-time curve and Schroeder curve will also get the same filter settings (if they are displayed in the same window).
To change the filter
settings, first go to Plot->Plot Type Settings->Active Plot… to open the active plot type settings. In the dialog box, make
sure is checked and the
click the
button to display
the filtering settings. Select the type of filtering you wish to use and click
the OK button to exit the dialog boxes.
Note: The filtering will also be applied to the
frequency domain plot-types if is checked in Plot->Plot Type Settings->General
Frequency Domain....