Hi

Thanks for your reply. I find that this method isn't accurate.

The first problem for me is the selection cycle option isn't activate by default. I must ctrl +w to activate it on every dwg.

The second problem is that I have a lot of dwg with the same polyligne on different layer that are superpose.

So every time I want to select one of the polyligne, I just press a lot of time shift + space and click and hope to select the right one.

I don't know if for the next version of autocad for mac it's possible to do something about that. I see windows for block attribut so maybe it will be possible to use a keyboard shortcut to display a window of overlapping objects.