Frontend System Design

How would you implement a menu structure that collapses open sub-menus when a new parent is selected, while maintaining the expanded state when interacting with nested sub-menus?

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Interview question asked to Frontend Engineers interviewing at Twitch, Chewy, Canva and others: How would you implement a menu structure that collapses open sub-menus when a new parent is selected, while maintaining the expanded state when interacting with nested sub-menus?.