Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Calculation For Contact Form 7
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qTranslate loves WPEC
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hideShowPassword
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Ultimate Product Catalog
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Advanced Image Comparison for Elementor
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Ultimate Image Gallery – Image Zoom, Viewer, Lightbox and Filter Gallery
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Connect Matomo – Analytics Dashboard for WordPress
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Category Posts Widget
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Ultimate AJAX Login
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Post Carousel Slider for Elementor
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The School Management – Education & Learning ERP
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pbSocialNetworks
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Amp Stories for WordPress
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Departamentos Uruguay for WooCommerce
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Welcart e-Commerce
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Disable Post Locking
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Mail2Admins
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Twitter Cards
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Filr – Secure document library
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Error Log Viewer By WP Guru