You can access the editor using the following options:
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The Devicetree action in the Actions View, available when the active build has a devicetree file structure.
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The Show Visual Editor button in the Editor toolbar after opening a devicetree file.
Either of these options opens the main screen of the visual editor in a tab in the Editor, from which you can use the Open Text Editor button to jump to the related code location in the .dts, .dtsi, or .overlay file.