Using wp single login you can easily add the functionality to allow only single login per user.
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Yoast Duplicate Post
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Complianz – GDPR/CCPA Cookie Consent
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Kwayy HTML Sitemap
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Child Theme Configurator
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OMGF | GDPR/DSGVO Compliant, Faster Google Fonts. Easy.
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Jetpack Boost – Website Speed, Performance and Critical CSS
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Multiple Roles
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Responsive Team Members Showcase, Team Grid, Team Slider, and Staff List – Smart Team (formerly WP Team)
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Image CAPTCHA for Contact Form 7 and WPForms by HookAndHook (DSGVO/GDPR)
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EmailKit – Email Customizer for WooCommerce & WP
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Addonify Floating Cart For WooCommerce
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Contact Form 7 Táve Integration
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Advanced AJAX Product Filters
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Custom Block Patterns
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Album Photostream Flickr Gallery
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AI Popup Builder & Popup Maker by OptiMonk
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Call Now Button Ultimate
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The Future Is Now
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HTML Template for CF7
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Extra User Details