Can’t add to “GROUPS” – option has disappeared from top of screen under “PEOPLE”

I am trying to add new contacts to existing groups.  Usually under PEOPLE the whole list of Contacts comes up with the word "ALL" at the top and then there is normally a down-arrow beside that to select specific groups you've created.  Now "Groups" is not even coming up as an option at the top of my screen when I'm trying to add a new contact to a specific group.  It only give me a "Delete" option or "Add to Favorites" at the top.  I have about 20 different email groups set up . . . where did they go and why can't I access them now . . . HATE. HATE, HATE this new OUTLOOK!!!!!  Why can't Microsoft just go back to the old Hotmail format instead of forcing changed on people without their consent??!!!