Custom info can be changed via the config settings, found in \inetpub\wwwroot\{tenant name}\{workspace folder}\Configs\NDAW.Html.Front.config

To fully integrate the Wopi editors on the fileserver, you need to have an own url configured. This url may not be the same as the workspace url. Keep in mind that you need to set a domain with an valid SSL binded.

<setting name="CustomWopiSrcDomain" serializeAs="String">
  <value>wopieditors.contoso.com</value>
</setting>