Hello Roger,
Welcome to Atlassian Community!
When it comes to public access, the backlog is a menu that won't be visible even if permissions are changed on your site.
It's possible to allow people to see tickets from a project, but boards or backlog won't be available for them, only licensed users have this permission.
I can see that you are using Cloud free and this plan has a limitation regarding permissions, so in case you want to let tickets public, you will need to upgrade your plan to Standard or Premium.
For more details about how to enable public access on Standard/Premium sites, please check the documentation below:
Regards,
Angélica
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