Simply by enabling the plugin can set up a basic auth to dashboard and login page.
More Plugins
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X3P0 Legacy Widget
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Easy Logo Link Change
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Vendi Cache
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WP Maintenance Switch
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Beaver Charts – Beaver Builder Chart Module
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Simple Login Screen Customizer
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Force Authentification Before Checkout for WooCommerce
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BH FAQ
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Tag Cloud Shortcode
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Lonely Sticky
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Lightweight HTML Minify
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A Note Above – WP Dashboard Notes
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Widget Click to Chat
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Codescar Radio Widget
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Error Monitor & Notifier
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Teaser Post Title
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Easy Fontawesome
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Noindex Password-Protected Posts
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Multiple Ajax Calendar
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Exclude Custom Post Types From SEO Sitemap