Forum Moderators: Robert Charlton & goodroi
Their link to "tips on how to locate your HTTP pages" is here:
HTTPS usage
A page must be served over HTTPS to be eligible for Good page experience status. The Page Experience report doesn't consider HTTPS criteria when calculating URL status, only as a site-wide warning: if your site has a relatively high percentage of HTTP URLs, you will see a Failing warning in the Page Experience report. We don't yet have a report that shows details about HTTP vs HTTPS on your site, but here are tips on how to locate your HTTP pages, and here's a guide describing why HTTPS is important, and how to implement it on your site.