Some sectionals, like the Walsunny Convertible Sofa, come with built-in magic stickers. These keep the adjoining chairs in place. If yours doesn't have this feature, then you can try store-bought options. If you find such products expensive, you could always buy these cheaper alternatives: • Gate hooks and eyes for each portion • Slide-bolt latches attached underneath the sectional • Plastic cable ties to keep the sectional feet together