Hi Bill,
(disclaimer: I'm a newcomer to NanoVNA, so please don't assume I know the best method for doing this)
Please see the attached screenshots.
In brief, the values you see on the display at the top are for four traces, all set to S11 in your case, and displayed in various formats.
If you click on Display, you can click on Trace and choose the color of interest (for instance, green in your case, which is displaying the (-453m-j48.3) value). Make sure you don't accidentally gray it out, since that disables the display of it. You can simply tap it again to un-gray it.
Then, click on Back, then select Format S11 (refl), then click on the text Smith. In my screenshot, it's defaulted to impedance (R+jX), not normalized. Yours will be different. You'll see a large selection; you can choose the one of interest.