devicetree in VS code

Question

Hi 
 
 I would like to use DeviceTree in VS code. The VS code had installed "nRF Connect for VS Code Extension Pack" and tools chain. 
 But I can't see any file in "DEVICETREE VISUAL EDITOR". 
 What is missing? Is it not yet install? If yes, please let me know how to install it. 
 I know it is very simple for you, but I need your hint to fix it. Please share your advise with me. 
 
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