An Overview of GIMP 2.8 - Beginning Photo Retouching and Restoration Using GIMP - page 18

Layer Groups
Layer groups are new to GIMP 2.8 and are very helpful for organizing large numbers of layers. Layers within
a layer group can be toggled on when you have to locate a particular one and then toggled off to hide the
layers within that group. This will help make your work go smoother when you work with complex images
composed of a large number of layers (Figure 1-17 ). I named the layer group Tonal Adjustment Layer Group.
Some images might have more than one layer group, depending on the complexity of the work being done.
Figure 1-17. Keeping layers organized in a layer group