is there a way for someone to be in your presence and control remote control your device

Ever since I've had this installed it seems like somebody is able to remote control my device of some type or get my data and I have a delay and they are able to do so forth and a friend of mine installed the browser and I swear I can swear that I seen a account online photo account of mine and her phone and also in maps it says the real time sharing and it will say somebody's 50 ft away how accurate is this browser on this with Samsung division