Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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exovia GDPR Google Maps
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JSM Non-Breaking Space (nbsp) for French Content
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SCM – Smart Currency Manager
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Email addon for CF7
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Event Organiser
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Flexible Subscriptions
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WP Post Redirect
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Easy Photography Portfolio
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WPBruiser {no- Captcha anti-Spam}
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Responsive Slider Gallery – Responsive Image Photo Slider
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Ultimate Maps by Supsystic
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WPOSS阿里云对象存储
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Quick Bulk Post & Page Creator
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BuddyPress Profile Tabs
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Gantry 5 Framework
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All in One Time Clock Lite – Tracking Employee Time Has Never Been Easier
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RevivePress – Keep your Old Content Evergreen
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Elemailer Lite – Elementor email template & campaign builder
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Pretty Google Calendar
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Post Lockdown