Files & Customization
To better organize your sprite, you can group a set of layers in a little folder:
With groups you can show/hide (Shift+X) or lock/unlock several layers at the same time, or expand/collapse the folder in the timeline (Shift+E)
To create a new Layer Group you can use the Layer > New > New Group menu, or pressing Alt+Shift+N shortcut. If there is a selected range of layers in the timeline, the new group will be created containing those selected layers automatically.