To select a layer on the Canvas, simply click on it. When you do this, you’ll see selection handles appear around that layer.
You can also select a layer in the Layer List by clicking on its name.
Tip: If you can’t see the selection handles, check they’re enabled by heading to View > Canvas > Show Layer Selection.
Selecting multiple layers
To select multiple layers, select your first layer, hold ⇧ and click on another. You can also hold ⇧ and click on a layer you’ve already selected to remove it from the selection.
Alternatively, click-and-drag from an empty area on the Canvas to select any layers within your selection area.
Holding ⌥ while you click-and-drag will only select layers that are completely within your selection area.
Holding ⇧ while you click-and-drag, will add layers to your selection (or remove currently selected layers).
Holding ⌘ while you click-and-drag will remove any currently selected layers from your selection and add any unselected layers within your selection area.
You can also select all of the layers within a specific Artboard, by selecting the Artboard itself and choosing Edit > Select > Select All in Artboard from the menu bar.
Selecting overlapping layers
You can hold ⌥ to select the second layer underneath your pointer instead of the top one.
If you have more than two layers overlapping, you can Control-click, choose Pick Layer from the shortcut menu and select the layer you want.