Jugaad method is used to create core for a component (part) for molding. Placing the component in the assembly file and after creating a block (Part8^Assembly4 feature) cavity is created for the component and it was hidden.

Time

10.04-13.02

Solidworks tutorial | Mold Design in Solidworks | Cavity and Core in Solidworks - YouTube

What is the reason top view shows hidden component (even though it was hidden) and right view shows core?