While the operating system doesn't offer an option to pick which user accounts appear on the sign-in screen, you can easily hide any user from being listed by modifying the registry. For example, accounts for users who only login remotely to their PCs, or an account that you want to keep secret from regular users. However, there could be times when you may have some additional accounts that you don't want listed.
When you share your computer with family members or friends, Windows 10 by default will list every user account on the sign-in screen.
