Grouping products Woocommerce

HI my name is Lionel and i use woocommerce 3.0.5

when i go to simple product, i’m unable to find the “Grouping Products” option in the Linked Products Tab. It’s unvisible

i don’t know what i can do , can you help me please ?

by the way i desactived and reactivated all my plugin nothing happen

“>image something is missing