I don't think this will be due to a config setting. It sounds more like the page is only rendering partially. You can probably still edit each page by appending
?do=edit to the URL.
For the partial rendering, check your error logs. See also
https://www.dokuwiki.org/faq:blankpage
For further debugging, you might try appending
?do=check to at least see if you've got an issue with file permissions. Otherwise check out
https://www.dokuwiki.org/devel:debugging