Horse doesn’t have a permanent address bar at the top of the window. URLs live attached to each page in the sidebar instead, visible when you reach for them, out of the way the rest of the time.
The reasoning is the same as why apartment buildings don’t put their full street address on the front in 80-point type. The information is there when you need it; it doesn’t need to be on display while you’re walking past.
Viewing or editing a URL
Double-click any page in the sidebar to reveal and edit its URL. Or click ••• next to the page and choose Edit Link.
Copying a URL
Click the page once more to select the URL, then ⌘+C. Or pick Copy Link from the ••• menu. To copy the URL of the page you’re currently viewing without selecting it first: ⌘+⇧+C.