Chrom checking for SSL / HTTPS certificate

On my KDE Neon Plasma, Chrome checks but the website I am developing doesn't yet have an SSL certificate and some functionality is blocked by Chrome.

Because my Chrom is synchronised with my Android phone, on the mobile, the same problem.

But Firefox works OK, so does Safary on my wife's Apple Mac.

I can't find a way to disable Chrome for this blocking, followed several articles on searches, but nothing works.

Any suggestions?

Thanks