Auto fits the drawing to the Print area h*b size, i.e. fits it to the paper. This is useful, for example, when you are printing draft drawings on A4. With this option you can include everything in the printout, but the scale of the drawing may be affected as drawing size is fitted to the Print area h*b.
With Auto , if the drawing size is smaller than the paper, the drawing is scaled up to fill the defined Print area h*b , keeping the aspect ratio.
Entering an exact scale in the Scale box scales the drawing manually to the defined scale.
Examples on Scale : 1.0 = 100%, 0.9 = 90%
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