Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Fluent Support – Helpdesk & Customer Support Ticket System
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Vimeotheque – Vimeo WordPress Plugin & Video Gallery
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Enable Database Tools
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Relevanssi Light
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Ultimate Member Custom Tab Builder Lite
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Easy Notification Bar
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Floating Login
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ManageWP Worker
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Backuply – Backup, Restore, Migrate and Clone
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Easy Custom Auto Excerpt
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WPB Popup for Contact Form 7 – Showing Contact Form 7 Popup on Button Click
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Gaug.es
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Prime Slider Addons for Elementor
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Decimal Product Quantity for WooCommerce
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iPanorama 360 – Advanced Virtual Tour Builder
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Piano Block
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End Page Slide Box
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In Memoriam (Light a Candle)
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Easy Loyalty Points and Rewards for WooCommerce
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Yandex Maps for Gutenberg