@Ivan - have you tried using the '%' unit in the Stroke &Fill > Stroke style' tab?
If I have a selection of objects with different stroke width, and change the stroke width to 80%, the width of each selected object is reduced by 80%.
@Ivan - have you tried using the '%' unit in the Stroke &Fill > Stroke style' tab?
If I have a selection of objects with different stroke width, and change the stroke width to 80%, the width of each selected object is reduced by 80%.