I would like to unapprove an app.

I have managed to find a workaround for this issue.

In order to block an application you have to activate Screen Time and App Limits.

From there you can sett 1 minute on the app you'd like to block/restrict..

I understand that you can close a thread if it dies out, but within hours beats the point of having a community. People have lives next to reading forum. Besides the first anser was outside the scope of what I was asking. You're answer on the other hand is very relevant and I might give that a go, thank you for joining in.

I'll check it out and get back to you.

I’m sorry but in-app purchase does not un-approve an app or prevent child from downloading. This feature is for some thing else.

I know I can contact support, but this is a community forum and closing this down within hours is bad practices for a forum. :)

Just tried what you suggested and it does take away the cloud icon from App-Store, like it was never purchased to begin with. But the Child can still download this without guardian approval.