GGU-CAD: "Scales" menu item
The scale of the drawing in both x- and y-directions can be specified using this menu item. In addition, the position of the left edge of the screen (x-value of origin) and the bottom edge of the screen (y-value of origin) can be specified.

If the scale is altered after an object has been drawn and dimensioned, the dimensioning must be renewed because the dimension text is not adapted automatically.