It doesn't look like VS Code has a built-in single-press keyboard shortcut to save all open files on Windows.
The simplest way would be to use the menu accelerators: ALT+F, followed by ALT+L.
Alternatively, you can change the key binding by editing the keyboard preferences:
![VS Code with File menu open, Preferences, Keyboard Shortcuts highlighted](https://i.stack.imgur.com/VGEp8.png)
Add the binding to the right half of the screen, then restart VS Code:
// Place your key bindings in this file to overwrite the defaults
[
{
"key": "ctrl+shift+s",
"command": "workbench.action.files.saveAll"
}
]
![enter image description here](https://i.stack.imgur.com/BfsLm.png)
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