HTTP Authentication lets you make a site without letting anyone view it without valid credentials. This can protect the full site or only admin pages.
Plugin Tag: restrict pages
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Restrict Posts based on Conditions – Conditional Post Restrictions
Restrict , hide , or block the content of your WordPress posts using a conditional rules system.
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Membership Plugin – Kadence Memberships
Kadence Memberships is a powerful WordPress membership plugin that gives you full control over who can and cannot view content on your WordPress site.

