Right-click the sheet node in the tree
and select Sheet.X object > Print Area > Edit Print Area.
This zooms onto the print area, which is outlined as
a purple dashed box, with an X cross at its center.
Use the handles at the corners of the box to redimension the print area.
Drag the dashed box or the central X cross to reposition the print area.
You can then exit the print area visualization mode by pressing the
Escape key or by clicking elsewhere in the
drawing. You can see the sheet properties to verify that the coordinates,
width, or height are updated.
Change the sheet properties as wanted, and then click
OK to validate.