In iOS 13 and below, it was possible to change settings for App Store purchases by navigating to Settings/Account Name/iTunes & App Store - this can be confirmed by taking a look at the following Apple Support page:
https://support.apple.com/en-us/HT204030
As of iOS 14, however, the "iTunes & App Store" page appears to have been replaced by "Media & Purchases". When tapping on this option, I'm immediately taken to what looks like the profile page for my Apple ID which doesn't give me any password preferences. Has the option to manage these settings now been removed?