https://code.visualstudio.com/docs/languages/markdown
Ctrl - Shift - P: Workspace: Duplicate Workspace in new Window
Ctrl-K Ctrl+0 - alles falten
Ctrl-K Ctrl+1 - Level 1 falten
Ctrl-K Ctrl+2 - Level 2 falten
usw.
Ctrl-K Ctrl+J - alle ausfalten