Creates the unit under the selected user's ~/.config/systemd/user directory and manages it with systemctl --user.
User units run inside the user's systemd manager. For service units, User= and Group= are not written because the user manager already runs as that user.
Choose this for applications that belong to a user account and should use that user's home directory, environment, and user unit lifecycle. Choose No for a normal system unit, even if a service unit later uses User= to drop privileges.