Disable Customer Registration
This extension allows you to disable the customer registration in your Magento store.
It can be very useful in cases where Admin wants to create account for customers (B2B) and do not want to show the default Registration form & link on his Magento store
cd to your magento webroot
composer require deved/magento2-disable-customer-registration
bin/magento module:enable Deved_DisableRegistration