Composer URLs are user-friendly, which means you can usually deduce the page path just by reading the URL. There's an even easier way, though, using the page ID.
Composer creates an internal page ID for each page that you make. It basically allows us to identify the page with a number. This way, if you change the page name or its location, links to that page will not break. This page ID comes in handy when you don't know where the page is located on your site. Once you know the page ID, you can input the URL while you are in Composer and go directly to that page.
To get the page ID, you'll have to look at a bit of code. Right-click in your browser and click "View Page Source." Look for the <body> tag, or use Ctrl + F or Cmd + F to search for "body" in the code.
On the <body> tag, you should see a "data-pageid" attribute with a number. This number is the page ID. Copy the number, without the quotation marks.
Now that you have the page ID, you can paste it into the Composer URL and jump to that page. The Composer admin interface URL looks like this:
The number at the end is the page ID for whichever page you're on. Paste the number you copied from the page code in place of the existing number, and hit enter to navigate to that page.