Thank you once again, Falcon!
I read about and tried a few launchers now, but I couldn't achieve my goal yet.
I meant to have the two different homescreens without an Amazon login.
I was hoping that there would possibly be a launcher with more than one setup - so one for my kid, and one for me, secured by a password. I read about hiding apps in the shade launcher, which could have worked for my case too, but I can't even find the promised "hidden category" anywhere nor a description on how the feature works in detail.
It's not as easy as I imagined or I'm just too shortsighted and I'd be really glad if someone could give me another hint!