Something strange has happened. After you book an item you go to the confirmation formular where until now name, address, place, etc could be entered (see screenshot: I set which fields should be shown and which should not)
Suddenly there are a lot of other fields that I don't know where to set that they don't need to be displayed and also fields which are set as "hidden" are being displayed. What has happend? All fields that are slashed in red should not be displayed. Where can I set that?

I would like to close this issue. The problem why I saw all fields was that I accessed with a superuser. With a normal user i can see only the desired fields.I write that because perhaps somebody can have a similar problem.