Appreciate the detailed reply – I did toggle this, and my checking a while ago, sees it working as expected now.
Possibly my earlier tests were without my having ‘exited’ my changing things in Screentime properly – which is why it was maybe not picking-up/‘saving’ the changes I had made.
I will follow-up with my s-i-l to see if what is switched on that side – but suspect this is the missing piece!