Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Customize WP-Login
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User Sync for Azure AD / Azure B2C
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Custom Cursor For WP
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Admin Taxonomy Filter
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Sortable Dashboard To-Do List
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WEN Skill Charts
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Titan Anti-spam & Security – Brute Force Protection, 2FA & Spam Filter
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BCM Duplicate Menu
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Quotes and Tips by BestWebSoft
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Easy Heads Up Bar
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Send Chat Tools
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Simple Indeed Jobroll Widget
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Restaurant Menu and Food Ordering
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Daisycon prijsvergelijkers
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Quantity Discounts, Breaks & Product Bundles for Woocommerce By Bundler
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GS Custom Login
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EventPrime – Events Calendar, Bookings and Tickets
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Easy Add Thumbnail
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PageSpeed Ninja – Cache, Minify, Defer CSS JavaScript, Critical CSS, Optimize Images, Convert WebP
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Elastic Slide