OH3+Openhabian: Beginner UI not recognizing sitemap

I have created a sitemap with a few items which shows fine in Administration -> Settings -> Pages. Now, if I start the BasicUI using the icon in the upper right corner, it tells me that there are “no sitemaps defined”. In the settings of BasicUI, it entered the name of the sitemap (“default”) as the parameter “Default sitemap” which does not help. How can I define/set a sitemap for BasicUI?