I hope I’m in the right place with my question.
I run OpenHab on an Ubuntu 18.04 VM by now. Now I can access the configsite via ipadresse:8080 and then do everything I want to do.
Quoted by @rlkoshak
“You can configure the Nginx reverse proxy for each UI. It doesn’t have to be all or nothing. Reverse proxy is the only way right now to add authentication and authorization.”