Change purchase sign-in settings for Windows Store
The Windows Store asks for your password every time you buy something. To simplify purchasing and skip the password step:
Go to the Store app, and select your sign-in picture next to the search box.
Go to Settings > Purchase sign-in > Streamline my purchase experience.
Turn the switch to On.
This will let you buy from the Store without entering a password.
Your other devices will not be affected until you change the setting on each one.
This setting applies to in-app purchases.