Before you can move or modify layers, you must first select them. Furthermore, you can select and edit a single layer (including layer masks, adjustment layers and fill layers) in isolation.

Move Tool To select a layer:

Do one of the following:

Move Tool To select multiple layers:

Do one of the following:

Expand/Collapse To select a specific child layer:
  1. On the Layers panel, expand the parent layer or layer group to show its contents by clicking the layer's arrow.
  2. Click to select the child layer.
Move Tool To deselect layers:
To isolate a layer for focussed editing: