To Specify the Line Weight of a Layer Group (AutoCAD Mechanical Toolset)

1. Click Home tab > Layers panel > Layergroup Manager. Find
2. In the Layergroup Manager, right-click anywhere in the Lineweight column.
3. If there is no tick mark in front of Use Layergroup Lineweights, click it once.
4. Click in the Lineweight column of the layer group you want to edit.
5. Specify a line weight.
6. Click OK until all dialog boxes close.