Sure we don't like our focus interrupted, but that's what work is. It's dealing with the managers and leads that need to ask you something urgent while managing your deadlines and dealing with noise which is still very much present in a closed-office area unless you are the board members that get to work remote.
It really isn't normal to be constantly interrupted. I'm a developer managing 2 other devs and dealing with stakeholders and still manage to go many hours without interruptions. It's all about respect and being organized. Most urgent things only become urgent because somebody dropped the ball. Improve the way people work and organize that work, and the urgencies go away. You do need to retrain some people a bit to be respectful of your time, but mostly it works out because mostly people mean to do right by each other.