In the Layer List, you’ll find all the Pages, Artboards and layers in your document. You can reorder and rename all of these from here.
How to hide and lock Layers
To hide a layer, hover over its name in the Layer List and click the eye icon that appears. If there’s an eye icon 
next to a layer before you hover it, the layer is already hidden. You can also use ⌘ + ⇧ + H to toggle hiding and showing layers.
To lock a layer, hold ⌥, hover over a layer and click the padlock icon 
that appears. Click the padlock to unlock it. Or use ⌘ + ⇧ + L to toggle a layer’s lock on and off. When you lock a layer, you won’t be able to edit or move it.
How to search the Layer List
If you have a document with lots of layers, you can use the search bar 
at the top of the Layer List to find a specific layer type. You can also use the search bar to find a layer by name.
Tip: Layers with long names will be truncated in the Layer List. Hover over any truncated layer name to see it in full in a tooltip.