Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Shipping Live rates for Australia Post for WooCommerce
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Votely by WPGens
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States, Cities, and Places for WooCommerce
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WPKoi Templates for Elementor
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Post View Count
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Master Slider – Responsive Touch Slider
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Open Graph and Twitter Card Tags
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Dynamic Visibility for Elementor
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Arconix Shortcodes
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301 Redirects & 404 Error Log
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My auctions allegro
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Simple Staff List
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Crypto Converter ⚡ Widget
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WP User Stylesheet Switcher
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Resizable Sidebar for the Gutenberg Block Editor
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Vectr – Embedded Graphics Editor
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WPvivid Backup for MainWP
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Linked Variation for WooCommerce
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Registered Users Only
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KnowledgeBase with AI ChatBot HelpDesk – KBx