Hi Allen!
Thanks for reaching out.
We do not have any template named Flow though. Did you tried to mean the Unfold template, since the screenshot shows this template?
A template controls the overall look and layout of a site. The template does not include any modules, components nor demo contents. If you manually install the template on your existing setup, you will need to manually create each article, add menu items, and install & set all the modules to suit your needs.
JoomShaper template settings include really very basic options for overall layout and design, such as typography, colors, etc.
You may consider to download and install the quickstart pack in a staging site or on your localhost, then use the export/import feature of the SPPB to get the SPPB pages from the test site to your live site. All SPPB pages can be exported. But not the category blog or similar pages.
Please let me know if you have anymore queries, I will try to answer them.
Best reagrds,