1.This command is accessible in the File menu > Layers sub-menu with the 
Layers button and in the toolbar (Desktop version).
2.It can also be accessed on the pan frame with the Layers button.
The Layers button can be found in the top left side on the pan frame.
Accessing to the Layer Manager command in the menu
Accessing to the Layer Manager command in the menu in the Desktop version
Layers button on the pan frame
Opens the Layers panel.
Keyboard command: D