journalctl has no particular config on personal computer

Hi,

I've noticed recently journalctl takes ±1,5G storage on Ubuntu(budgie) 20.04 after few months of not-so-intensive usage ( it's a pc at home ).

django@ASGARD:~$ journalctl --disk-usage
Archived and active journals take up 1.4G in the file system.
django@ASGARD:~$

Shouldn't this « journal » be set to free space automatically on desktop computer ?

Actually this is its config' file on 20.04 :

django@ASGARD:~$ cat /etc/systemd/journald.conf
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See journald.conf(5) for details.

[Journal]
#Storage=auto
#Compress=yes
#Seal=yes
#SplitMode=uid
#SyncIntervalSec=5m
#RateLimitIntervalSec=30s
#RateLimitBurst=10000
#SystemMaxUse=
#SystemKeepFree=
#SystemMaxFileSize=
#SystemMaxFiles=100
#RuntimeMaxUse=
#RuntimeKeepFree=
#RuntimeMaxFileSize=
#RuntimeMaxFiles=100
#MaxRetentionSec=
#MaxFileSec=1month
#ForwardToSyslog=yes
#ForwardToKMsg=no
#ForwardToConsole=no
#ForwardToWall=yes
#TTYPath=/dev/console
#MaxLevelStore=debug
#MaxLevelSyslog=debug
#MaxLevelKMsg=notice
#MaxLevelConsole=info
#MaxLevelWall=emerg
#LineMax=48K
#ReadKMsg=yes

django@ASGARD:~$

As is, if for whatever reason the / partition gets close to full, journald is not aware and continues to « eat » storage.

It's just a feeling but I guess on a desktop computer ( not a server ) journald should be much less conservatory by default.

Am I wrong and why ?