There are visibility check boxes next to each layer listed in the object selector. By right-clicking a layer object, a shortcut menu will appear, allowing the following visibility options as applicable:
ShowMakes the layer visible.
Show + Hide All SiblingsMakes the layer visible and turns off the visibility of all other layers.
HideTurns off the visibility of the layer.
The visibility of a layer can also be controlled by the visibility settings in the individual layer objects.
To change which parts of a layer are visible, select the layer(s) from the object selector, then right-click the selection and select an appropriate rendering option from the shortcut menu. For details, see Master Topology Visibility, Topology Visibility, and Refined Mesh Visibility.