Visual Studio Code

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