SW 2018 - Select Channel

Hello 

I just upgraded Solidworks to the 2018 version. 

I can't get my hands on an essential function in a sketch: "select the channel". 

I found this help page: http://help.solidworks.com/2018/french/SolidWorks/sldworks/t_automatically_selecting_different_chain.htm?id=e63a6456dff84e0e86c7c347a942baec

but I don't see this "propagate" icon. 

Has anyone found the solution? 

Thank you for your help =)