un-applied plot settings changing settings in page setup manager

[Anonymous]

I'm used to being able to plot a window from paper space, to test on 8-1/2x11 how a portion of a large drawing looks full scale without having to plot a large sheet, and after I do this, the page layout settings have always remained unchanged by the plot.  Recently, for no apparent reason, when I print from a window on smaller paper, it changes the paper size in the page setup manager, even if I don't apply to layout.  Usually I can simply UNDO after my plot, but once I forgot and then made additional changes to the drawing that needed to be retained, so I had to go back into the page setup manager and re-select the paper size and relocate the drawing on the sheet.  How can I get it back to the way I've always known it to be, where changing the paper in the plot setup doesn't change it in the page setup manager?

[user181]

Make sure to uncheck the Save changes to layout option.

[GrantsPirate]

Are you for sure talking about the Page Setup Manager or just the plot dialog that appears when you go to plot/print?