How to disable 'root' initialization for services when they have been injected into another angular app?

In our project we have 2 angular apps, admin panel and client page. Of course we have angular services, some of them shared between apps and some only for admin or client. While fixing some shared components I noticed that if I inject admin service, which declared in 'root', to any component or service in client, it initialize without even warning and works correctly. I want to disable that behaviour and set exact root parameters for any service, if it's possible. AppModule and main.ts are different for both apps, so i don't know where to even look for