Using Layer Categories
Layer categories can be assigned to layers to organize them and make them easier to search. When layer categories are enabled, a category tree displays on the Layers page, by which layers can easily be filtered according to their assigned category. When a category in the category tree is selected, the layer list is filtered to only show layers in this category.
There are two predefined categories that cannot be renamed or deleted:
All – Contains all the layers from all the categories
Uncategorized – Contains all the layers that weren’t assigned to a category