Where are the full editing options for category pages?

Hello,

Could someone please let me know how I can edit a page category as a normal page? I can’t find the page anywhere, not under “Pages”, not under “Portfolio Category”.
I can locate the list of categories under “Portfolio Category”, but if I chose one and click “Edit”, i only have these options to edit:
Name
Slug
Parent
Description

No other options to format the page are provided, such as “Title Position”, “BG image”, that we get when we format the pages under the “Pages” section.

Right now I have:

When I click any thumbnail item of my portfolio page, it takes me to the respective page with info about that item, but when I look at the breadcrumbs, I can see a category page which I can’t find proper editing options for it.

Please let me know if you need login access.

Many thanks