think you own the place
think (one) owns the place
To behave in a haughty, arrogant, or imperious manner. The contractor they hired must think he owns the place, judging by the way he's telling us all how to do our jobs!
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
think you ˈown the place(also behave/act as if you ˈown the place) (disapproving) behave in a very confident way that annoys other people, for example by telling them what to do: What does she think she’s doing, coming in here acting as if she owns the place!
Farlex Partner Idioms Dictionary © Farlex 2017