Display Categories Widget will display Child categories on your sidebar. Can be placed on widget in sidebar.
More Plugins
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Sitewide Notice WP
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Conditional Payments for WooCommerce
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Tabs popular posts and latest posts
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Votely by WPGens
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Announcement & Notification Banner – Bulletin
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Autonomos
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Quick Download Button
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Innovs WPBakery Visual Composer WHMCS Elements
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WP Event Aggregator: Import Eventbrite events, Meetup events, social events and any iCal Events into Event Calendar
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WP Login Form
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Disable WP Registration Page Spam
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Divi Advanced Custom Types
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Orderable – Restaurant & Food Ordering System
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Admin Management Xtended
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Child Pages Shortcode
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Depicter — Popup & Slider Builder
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XT Floating Cart for WooCommerce
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Social Media Badge Widget
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Export All URLs
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Arconix Shortcodes