Through settings.ini it is possible to define behavior of the navigation's exit button.
Please note this setting is available since the release version 13.5.3.
The variable is onBackBtn and is available in [RuntimeSettings] section.
The possible values are as follows
;onBackBtn=minimize | exit | disable
The minimize option will put the navigation into background.
The disable option will disable exit key.
In case of the exit variant the exit behavior will follow the settings of m_bSetShowExitMsg