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The outermost lines on the Revit titleblock families are drawn at the extents of the sheet size. Since these lines won’t print when you send sheets out to be plotted, can they be hidden or otherwise turned off?
Maybe, but that might affect the scale of your printed drawings, or the margins. If you turn those lines off and print, Revit wouldn't know what the extents of the sheet are supposed to be, or how much margin you desire between the edge of the paper and the inner, visible frame of the titleblock.