Kill user processes on logout
Arch Linux builds the systemd package with --without-kill-user-processes, setting KillUserProcesses to no by default. This setting causes user processes not to be killed when the user completely logs out. To change this behavior in order to have all user processes killed on the user's logout, set KillUserProcesses=yes in /etc/systemd/logind.conf.
Note that changing this setting breaks terminal multiplexers such as tmux and screen. If you change this setting, you can still use a terminal multiplexer by using systemd-run as follows:

Page de liens personnels sur systemd