Mac is different on startup/sign in When I am signing in to my user account, there is a user interface with a black or white (about the dark mode or light mode is selected) background, there are two text boxes for username and password. When you type the username and press enter if the user is found you hear two beep sounds and get to the password part; if the user is not found you hear one beep sound and you type your username again. In the password part, you get a beep sound for every character you enter, if your password is correct you get three beep sounds.
How can I fix this, I want the normal (select user, enter password) user interface
MacBook Air (13-inch, Mid 2012), macOS Catalina 10.15.7
When FileVault (System Preferences/ Security &amp; Privacy/ FileVault) is open to activate the mac you need to enter an administrator password or the recovery key (or Apple ID for reset). The password screen appears when you want to open either a non administrator, guest, or administrator user.
The username-password UI appears when opening the mac, to get rid of it turn off FileVault from System Preferences/ Security &amp; Privacy/ FileVault.

FileVault secures the data on your disk by encrypting its content
automatically.