Can not find how to change / delete phone number from the storefront page

Hello everyone,

Recently i got hired by a company to sell their stocks on marketplaces, and so we noticed that the personnal mobile phone number from my colleague is avaible to everyone visiting our storefront (he is also the one who have set the double authentification and used his personnal mobile number for it)

Now we want to change that , does changing the number used for the double authentification will work? we absolutely need to get this solved

Thank you for reading everyone