To make all objects visible/hidden, click on the open/closed eye icons.
If an object is visible, it is displayed with a blue border and eye icon. To hide an object, click on it.
By default, the defined objects except the Outer Contour are set to visible.
Click on the arrow beside the object of interest to see additional information:
If a single object is selected, it is highlighted in orange and all views are centered on that object.