For more, see Layer Visibility
Located: Layer Manager
When a layer is setup within GeoSync from the Layer Manager, check the Visible box so that the layer's features are visible on the map view. The Visible check box in the Layer Manager has the same function as the check box in the Layer Legend.
To use:
Open the Layer Manger.
Select desired layer.
Check or un-check Visible.
Select OK.
Alternately, check or un-check the box next the layer name in the Layer Legend.