caller groups on galaxy S6

I just activated a new Samsung Galaxy S6 Smartphone a few weeks ago. I set up several Caller Groups and assigned most of my contacts into the Caller Groups that I created. Suddenly, in the past couple of days when I go to call via a caller group the "Groups menu which was in the row at the top of my phone application next to LOG, FAVORITES, and CONTACTS has disappeared. Where is it? I am confused because when I check an individual contacts and look at what group they are in, the group name is listed, yet I cannot seem to find the GROUP menu with all of the various contacts listed under each group. How do I get this menu choice back or were did it go?

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I have an issue with groups now missing from my samsung s6 dial page . What do I need to do to retrieve this on my phone. It's so annoying.