It's located at C:\Users[Your Username]\3d Objects
You can right click it and 'Pin to Quick access'
You can have it appear in 'This PC' folders by running the following command from an admin Command Prompt or Powershell:
reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\{0DB7E03F-FC29-4DC6-9020-FF41B59E513A}"