You can change the lineweight of an object by
reassigning it to another layer, by changing the lineweight of the
layer the object is on, or by specifying a lineweight for the
object explicitly.
You have three
choices for changing the lineweight of an object:
Reassign the object to another layer with a different
lineweight. If an object's lineweight is set to BYLAYER, and you
reassign the object to a different layer, it acquires its
lineweight from the new layer.
Change the lineweight assigned to the layer that the object is
on. If an object's lineweight is set to BYLAYER, it acquires the
lineweight of its layer. When you change the lineweight assigned to
a layer, all objects on that layer assigned the BYLAYER lineweight
are updated automatically.
Specify a lineweight for an object to override the layer's
lineweight. You can specify the lineweight of each object
explicitly. If you want to override the layer-determined lineweight
of an object with a different one, change an existing object's
lineweight from BYLAYER to a specific lineweight.
If you want to
set a specific lineweight for all subsequently created objects,
change the current lineweight setting on the Properties toolbar
from BYLAYER to a specific lineweight.
