Please follow the screenshots to check the permissions.
'View pages' should be set to 'Everyone'.
You can also define permissions for certain page from here:
If you want the site to be visible without log in, 'View pages' should be set to 'Everyone' on both places.
If you need further assistance do not hesitate to contact us.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items