OpenVPN Client page missing proxy port field

[Selelvian]

Hey, I have a question.
I'm trying to configure an OpenVPN client behind a proxy, but it seems like the page is missing the Proxy Port field?
It's not a big issue, because I can always use the Advanced box to enter the http-proxy details, but I'm wondering if I'm just doing something wrong.

Please see the attachment for the error I get.