Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Collapsible Widget Area
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WP-Paginate
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CoSchedule
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Admin Bar Edit Content Links
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wp-Typography
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WP Calorie Calculator
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Gravity Slider Fields
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RabbitLoader – AI Speed Optimization, Caching & CDN for WordPress & WooCommerce
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miniOrange Social Login and Register (Discord, Google, Twitter, LinkedIn)
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Really Simple Popup
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Video Backgrounds for SiteOrigin Page Builder
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BestWebSoft's Twitter
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Mongoose Page Plugin
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TAO Schedule Update
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Lite Video Embed
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Product Attachment for WooCommerce
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Order Weight for WooCommerce
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WP phpMyAdmin
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Media File Renamer: Rename for better SEO (AI-Powered)