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 and objects with Type = Whole Brain 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, all views are centered on that object and a box appears in the 3D View, 1 x 1 View and Side by Side View layouts with the following additional information: