Plex data location on windows server

Where is the database located from Plex on a Windows Server 2019 ?

It has no %LOCALAPPDATA%\Plex Media Server in the user directory ??

It definitely does exist.

%LOCALAPPDATA% is a shortcut to C:\Users\<username>\AppData\Local

Keep in mind that the Users folder is hidden by default.
And maybe you are looking in the wrong <username> subfolder? If you are running Plex server under a different Windows user account, its data will be stored within this user’s data folder.