How to block specific apps? Specifically ones that were previously downloaded

Screentime: Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support

Parental controls: Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support

You cannot block an app that has already been installed (theoretically, it's been approved), only use screen time restrictions for that app.

You can block some apps thru screen time but not all. Some can be blocked by going into your kid’s account in Screen Time on your phone, then going to Content & Privacy Restrictions > Allowed Apps & Features. From here you can shut off Apple-made apps like Safari and FaceTime. I don’t think you can shut off 3rd party apps from the App Store here. The better way to do this has two steps: (1) go on your phone to the child’s Screen Time account, to Content & Privacy Restrictions > iTunes & App Store Purchase and set “Installing Apps” to Don’t Allow. This makes the App Store disappear from the child’s phone; (2) manually delete — on your child’s phone — the apps you don’t want him or her to have. Now they are deleted and your kid can’t put them back using the App Store. You can delete almost anything, including Safari and all 3rd party apps.

I was wondering the same thing, thinking I was missing something. It needs to be changed where you can disable an app on a child’s phone from a parent’s phone. 1 minute is enough time for them to engage.

I want to stop screm time

Gianabelle wrote:

I want to stop screm time

Go to Settings > Screen Time > Turn Off Screen Time, and enter the code that was used.