Apply context in dashboard 2.0

Hello,

in dashboard 1.0 to use the "Apply context" function just set the "Tag as Master" flag, in dashboard 2.0, I can't find this flag, I see the functionality already visible if I click on a row of the main form, but it doesn't work on the target form, why?

How do you activate this functionality "Apply context" on 2.0?

Thanks,