In Page Rules, the first match wins, so you can add a higher priority rule for www. Use a setting that matches your global settings and it should do nothing more than become ineligible to another Page Rule.
Thank you so much! I’m not sure what you meant by using a setting that matches my global settings, so I just selected “Always use HTTPS” as the setting. It worked.
Thanks again, stranger!
If you already had Always use HTTPS set globally, that’s what I meant. It won’t actually change any setting, but since it matches, it means it won’t be eligible for subsequent rules.