That only works if you set up a separate child account for a separate device and then manage it using Family Link.
If I want to hand my own phone over to a child for a while, there's no way (that I've found anyway) to prevent a child from installing all sorts of crapware on it.
On non-ancient Android versions you can have multiple user accounts. Create a new one and log it into your kid's family linked account. You can switch the user before giving it to them and they'll get the expected restrictions.
