Simply by enabling the plugin can set up a basic auth to dashboard and login page.
More Plugins
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ACF Permalinks
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Multiple WP Responsive Photo Gallery
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WP Custom Author Image
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WP-UTF8-Excerpt
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External links new tab – nofollow
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Jhakkas Elements
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SF GeoGuard
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WP Multibyte Patch
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PJW Page Excerpt
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Pimap
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NextGEN Gallery ColorBoxer
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Simple Wistia Embed
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MC Good-bye Howdy
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Hexa Team Responsive Grid Free
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ThemeZee Toolkit
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WP Browser/Platform Detection
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Remove Google Fonts
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Lock Your Updates Plugins/Themes Manager
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PiWeb Shipping method dropdown for WooCommerce
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WC Order Split