Please have a look here: The Console | openHAB ( this is a link into the documentation explaining what is happening and how to configure the change you would like to do )
@Wolfgang_S : Your feedback showed me the right direction. Summary: org.apache.karaf.shell.cfg shouldn’t be updated by the user because it may get overwritten when upgrading openHAB. Instead runtime.cfg should be adapted by the user. For my case I added now