Color groups overview
It is possible to organize your layers by using pre-defined Color Groups. Assigning the same color to several layers will also allow you to manage them simultaneously.
info
Download the John project to follow this section's instructions.
Click on the icon to assign your layer to a Color Group:

The menu below will then appear:
It allows you to assing your layers to a Color Group by clicking on one of the colors listed:

A Color Group button is present at the bottom of the Layer Stack:
Click on it to open the Color Groups panel (you can also open it via the Windows > Show > Color Group main menu):

This panel will list the currently used Color Groups and will be automatically updated when you create new groups.