This is separate from VS Code Vim / vscode-neovim: install this extension only if you want modal editing inside ProseMark.
How to use
Install ProseMark and this ProseMark - Vim mode integration.
Open a .md file in ProseMark — the editor starts in vim normal mode when prosemark.vimModeEnabled is true (default).
Extension settings
prosemark.vimModeEnabled (default true): enable or disable vim mode without uninstalling this extension. Changes apply to open ProseMark editors immediately (no full reload).