Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Payment Gateway for MTN MoMo on WooCommerce
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Variation Swatches for WooCommerce – Color, Image & Size Swatches
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Booktics – Booking Calendar for Appointments and Service Businesses
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Media Cleaner: Clean your WordPress!
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Cyr to Lat Enhanced
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Image Title Remove
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RSS Aggregator by Feedzy – Feed to Post, Autoblogging, News & YouTube Video Feeds Aggregator
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CBX Bookmark & Favorite
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Pages In Widgets
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Additional Variation Images Gallery for WooCommerce
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Inline Image Upload for BBPress
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PushAlert – Web Push Notifications for WordPress and WooCommerce
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Better Recent Comments
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Fuse Social Floating Sidebar
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Musopress Discography
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Supaz Easy Background – Easy way to add parallax image or video background
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WPOSS阿里云对象存储
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Easy Post Series
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Advanced Marquee Effect for Elementor
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Helpie FAQ — Accordion, Docs & Knowledge Base