This kind of stuff exists in Eclipse:
But I\'ve not found it in Visual Studio yet. Is ther
Had same need to see Code Outline: it's easier to understand someone's code organisation. Tried Ctrl+Shift+O and didn't like it. Found 2 free plugins in the marketplace. Tried this one by Patryk Zawadzki and found if handy and handsome.
After installation and reload of VSC look in Explorer pane new separator "Code Outline" at the bottom.