Selector Tool - Scale Line Width Button
The Scale Line Widths button on the Selector Tool Infobar selects whether scaling the selection also scales the line widths (thickness). With the button pressed in, the thickness of the lines changes in proportion as you scale the selection. With the button pulled out, line widths are unchanged by scaling. Line widths are not altered when rotating, skewing or stretching objects.
Notes:
With this button selected, the values in the Dimensions fields include the line widths of objects. When deselected, the dimensions exclude the outline width.
This button also affects Snap to grid. With this button selected, the edges of lines snap to the grid. When deselected, the center of lines snap.