Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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AI Mojo – ChatGPT / GPT-3 Playground for WordPress
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PayHere Payment Gateway
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Ajax Filter Search
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WP Modal Popup with Cookie Integration
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Sign Me Up
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Potent Donations for WooCommerce
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Typewriter
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BlockStrap Page Builder – Bootstrap Blocks
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NoMorePass Login
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Maintenance mode for WooCommerce
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Prisna GWT – Google Website Translator
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Event Booking Manager for WooCommerce
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Review Disclaimer
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xili-tidy-tags
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Simple Indeed Jobroll Widget
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Edwiser Bridge – WordPress Moodle Integration
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wpDataTables – WordPress Data Table, Dynamic Tables & Table Charts Plugin
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User Sync for Azure AD / Azure B2C
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Sortable Dashboard To-Do List
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Cyrlitera – Transliteration of Links and File Names