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The problem is the error message is misleading. The error message says "Cannot set LIMMIN when paper margins or background are displayed." You you won't find a 'paper margins' setting. And you can change 'Display paper background' all you want, but it won't change anything. Now, unchecking 'Display printable area'? THAT will allow the limits to be editable in paper space when you also uncheck 'Display paper background'.