If you want to select all lines to change them you can use Edit Select
Modify Selection Qualifier Type Line to select all the the lines. Once
selected, alt click lets you change them all.
pks123 wrote:
> Yes, that changes one entity at a time. But I want to be able to change ALL line widths, for example, with just by setting the general thickness parameter and just clicking (once) on each object. Otherwise I have to go in and change the parameter manually for each entity. Quite cumbersome.