@Vsevolod_Gromov that is peculiar. What services have you connected? In API docs when you do a GET /schema or a GET call on a table are you able to call the service and see the data? As a first step I would recommend flushing the system cache from the config tab and try reloading the page to see if more role access filters are exposed. Looking at my DF here when I initially selected the service from role access config I was given an asterik and blank (same as you were) but the tables and so on loaded within a few seconds.
Additionally, what browser were you seeing this in?