File > Preferences > Keyboard Shortcuts

Click “Open keyboard shortcut” button on the upper right corner.

[
    {
        "key": "F2",
        "command": "editor.foldLevel2",
        "when": "editorTextFocus && foldingEnabled"
    }
]

Reference:

• https://dzone.com/articles/setting-custom-shortcuts-in-visual-studio-code#:~:text=Visual%20Studio%20Code%20provides%20us,it’s%20Shift+Alt+F.