I want to have as few apps as possible on my mobile device, so I have not installed the Nintendo Switch Parental Controls mobile app.
During setup, I specified that the child is under 8 years old and that I do not want to use the app.
Now Nintendo Switch Parental Controls is active, you can see it at first glance on the home screen.
However, I do not know what this feature (without app) does exactly. I couldn't find any docs with a web search, only found marketing slides.