Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Sale Price for EDD
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Fast Velocity Minify
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Gutentor – Gutenberg Blocks – Page Builder for Gutenberg Editor
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Custom post types, Custom Fields & more
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ACF to Custom Database Tables
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Optin Forms – Simple List Building Plugin for WordPress
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URL Shortify – Simple and Easy URL Shortener
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Related Products – Create Upsells, Cross-sells, and Product Recommendations for WooCommerce
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Tabs popular posts and latest posts
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Autonomos
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Analytics Insights – Google Analytics Dashboard for WordPress
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Votely by WPGens
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Data Exchange for WooCommerce and 1C:Enterprise/1С:Предприятие
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Interlinks Manager – Internal Links Optimizer
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Divi Advanced Custom Types
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Democracy Poll
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License Manager for WooCommerce
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Social Media Badge Widget
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SEO SIMPLE PACK
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Lessify WordPress