Its a combination of ElvUI and Standart Blizzard UI , you will see most of the original blizzard interface but unitframes and bars are from
ElvUI. If you don't see your party members go into elvUI > Unitframes> Disabled Blizzard Frames > remove the ticks from (Boss , Arena ,Party , Raid) Also if u can't see Bags , go ElvUI > Bags > Bag-Bar and enable it.