@kuba If you consult the systemd documentation and the entries for $SYSTEMD_PAGER and $SYSTEMD_LESS¹ you'll find mention of some mysterious less(1) options but not what they mean or why they matter; but if you peek at the doc source code² you'll find that the behaviour you're describing is controlled by the presence of "K" in the default $SYSTEMD_LESS var, and you can override that out with, e.g.:
kuba