Unfortunately, what you want isn't really possible with segment logic. If you want to see a page related to orders, you need to use a visit (or visitor) level segment. And a visit level segment is going to return everything in that visit, so if you break it down by page it will return all of the pages that you saw in the visit. So, you have a couple options.
Option 1 - make the visit segment, break it down by page, then select the page name you want and click "display only selected rows" so it limits the pages seen.
Option 2 - instead of making a segment, make a custom metric for your conversion and use a different attribution model, such as linear or participation. Both of these would give credit to the page the page you're interested in (as well as every other page in the visit). Then you can bring in the page dimension and filter for the page that you want.