how to remove need for permission for apps for a child

Hi ngn77,

Welcome to the Apple Community, where some of us do our best to help each other :)

Wondering if this permission is set up in "Parental Controls", or in "Family Sharing". or in "Ask to Buy".

Perhaps the child uses Mac, or iPhone, iPad, or Watch.

You might want to browse the "Apple Support" articles below:

Use parental controls on your child's iPhone, iPad and iPod touch:

(You might want to scroll to "Allow Changes")

https://support.apple.com/en-au/HT201304

Approve what kids buy with Ask to Buy

Scroll to "How to turn on or turn off Ask to Buy

https://support.apple.com/en-au/HT201089

Change Family preferences in Family Sharing on Mac:

See "Details" : To see the details of a family member’s settings,

select the family member in the list and click Detail.

https://support.apple.com/en-au/guide/mac-help/mchl37e74c6a/mac

Change Purchase Sharing preferences in Family Sharing on Mac:

https://support.apple.com/en-au/guide/mac-help/mchl2dfa792e/11.0/mac/11.0

or perhaps you have set up:

Require a password for App Store and iTunes purchases

https://support.apple.com/en-au/HT204030

Hope this helps you :)