Italophile is correct.
Ctrl+S has always been a shortcut to Save. Still is.
If your display language setting is English, when you tap
Alt you will see ribbon accelerator keys appear. "F" is the File tab (backstage). Pressing
F takes you to that.
Then new accelerator keys appear and "
S" is save.
So, try pressing the following sequentially, not all together.
Alt, F, S
These are not traditional keyboard shortcuts. They came into Word when the Ribbon was introduced.
- They cannot be customized.
- They change to accelerate commands already on the screen.
- They do not show up in any list of keyboard shortcuts.