A prominent feature of your map is the Layer Legend, located on the left side of the screen.
Below is an example of what to expect in your Layer Legend.
Extent: Shows only layers that intersect with your current map view. Layers outside the view are temporarily hidden.
Scale: Hides inactive layers. Inactive layers, shown in red, are temporarily removed from the list.
Visible: Shows only the layers that are currently enabled on the map, temporarily hiding all disabled layers.
Has Features Here: Hides layers that have no features at your current map location.