The dot is only shown for failed units.
Alternative for #9644.
boot-efi.mount loaded active mounted /boot/efi
systemd-journald.service loaded active running Journal Service
systemd-logind.service loaded active running Login Service
-● user@1000.service loaded active running User Manager for UID 1000
-…
+● user@1000.service loaded failed failed User Manager for UID 1000
+ …
systemd-tmpfiles-clean.timer loaded active waiting Daily Cleanup of Temporary Directories
LOAD = Reflects whether the unit definition was properly loaded.