Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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TranslatePress – Translate Multilingual sites with AI Translation
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Captcha Them All
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PiWeb Product Enquiry or product catalog for WooCommerce
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PublishPress Capabilities – User Role Editor, Access Permissions, User Capabilities, Admin Menus
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Easy Theme and Plugin Upgrades
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6amTech – Payment Gateway for bKash and WC
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SKT Addons for Elementor
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DiviTorque Lite – Divi Theme, Divi Builder & Extra Theme
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Feeds for Pinterest – Showcase Boards and Pins on Your Site
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DNS Prefetch
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Sunshine Photo Cart – Client Photo Gallery & Photo Proofing for Photographers
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bbPress New Topic Notifications
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Watu Quiz
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Advanced Automatic Updates
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Forget About Shortcode Buttons
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CBX Poll
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Comment Cleaner — Bulk Delete & Disable Comments
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Same Category Posts
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Postie
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Unveil Lazy Load