Cannot enable Web View for a custom doctype

I am trying to create a Custom Doctype named “Wiki” and I want to enable the web view for it but that section is hidden on the DocType page.

I am also trying to figure out why this is the case. From a use-case point of view this doesn’t make any sense.

I meet this problem too, is there any suggestion?

In my case:

  1. Create new DocType named Books
  2. Create some new Books with image view (/app/books/view/image)

But there is no WebView when I do DocType > Books > Customize