In Word, File -> Options -> Save. The setting I found is "Don't show the Backstage when opening or saving files with keyboard shortcuts".

Hey Microsoft PMs, here's a feature for you: "Want to save to disk? Add the 'Save to Disk'-subscription, just $2/month!".

Clearly, we need an ad-supported $0.99/mo tier with a limit of 50,000 saves per quarter (additional saves $0.01 each).

$2.99/mo is what gives you unlimited* saves to disk.

* C:// drive only. External drives are limited to 10,000 saves per period)

Contact sales for enterprise pricing