A map layer is a collection of categorized features shown on the
map, such as roads, sidewalks or a bus stops. Using the Map
Contents and Legend panel, you can view the list of layers in
the map, turn the layers on and off in the map display, and
examine the symbols for layers. To examine the map contents: -
Click the plus button next to an item to expand an item. If the
item is a collection of grouped layers, this will expand the
group to show the layers in that group. - The check-box next to
the layer indicates whether the layer is currently visible in
the map. - You can click the check-box next to the layer name to
turn the layer on or off. The map automatically redraws to
reflect the changes in layer visibility. - Some layers may not
be visible at the current map scale (zoom level). This is
indicated by a checkbox that is grayed out: You may need to zoom
the map in or out to see a particular layer displayed. - If
layers have a plus button next to the name, you can expand the
layer to display the symbol as