In Power Pages once development gets completed, local login should be disabled. Process of doing this is to modify Out of box record related to local login flag present in site settings table should be made as false. Entire process was explained below way

Step 1 : Once you create a site as mentioned in previous blog post . Any user click on sign in button present in the home page screen looks like below and highlighted part of Sign in area in tab control represents local login.

Step 2: After Step 1,Now to disable this local login, navigate to Power Apps Management app present in the classic version of dynamics crm url and navigate to Site Settings Area and then filter Active Site Settings records with *localloginEnabled and you can see single filtered record as shown below

Step 3 : After Step 2, select record and change Value to false from true and save record as shown in the below way

Step 4 : After Step 3, navigate back to the sign in page of website and observe local login was not visible any more hurray and only user has to login with Azure AD option only as shown below

Conclusion : In this way, one can disable local login, which is one of the important action item when ever site moves to Production environments.