Selecting any of the below commands in the 3D view toggles the visibility of that type of object. If a check mark is present in the menu, then the object type is displayed in your circuit in the view shown in the project editor tab. If this option is not selected, then that type of object will not be shown in the circuit view. Note that this does not remove the objects from your circuit, they are simply not shown in the view.
View - Hide/Show Objects - Components
View - Hide/Show Objects - Brick
View - Hide/Show Objects - Metal
View - Hide/Show Objects - Ports
View - Hide/Show Objects - Vias
View - Hide/Show Objects - Solid Vias
View - Hide/Show Objects - Box
View - Hide/Show Objects - Levels