Parent and child url structure

I’ve just seen in another post that this might not be doable, but its so basic, and clearly MVP that I must be mistaken, so posting this to confirm:

I’m trying to find a way to make a page a child of another page. As an example, my site is split into two core areas, ‘design’ and ‘photo’. Under design I have a number of services, one of which is ‘brand’. Under brand I have a number of examples of my work. The url structure should be: /design/brand/brand-example-1.

Currently, I can’t seem to even separate design and photo - everything is on the same level. It’s hard to keep organised, and incorrect from a sitemap / seo point of view.

Can anyone help / confirm this isn’t doable?
Really wish I’d seen this before I paid for a year and spent weeks building out the site… Really hoping this is user error on my side!

Cheers
Thom

Edit:
SORTED IT
I knew it was user error. Thank $*#K for that. Leaving this post here in case no one else could figure it out:

Under SEO Basics, you can select a parent page from a dropdown, this automatically adds the parent page name to the url structure.

AS YOU WERE!