Preferences Dialog won't open / Explaining the magic key combination

I’ll add an excellent clearly explained graphic/text version from @dezmo

Follow this guide exactly after opening: Menu>>Window>>Preferences

  1. Hold down the ALT key. Hit SPACEBAR.
  2. Release ALT key
  3. Hit M (Move). (Note: assuming you have English windows otherwise you may need to replace “M” with a localized start letter, e.g. “L” in French)
  4. Hit one of arrow keys
  5. Move your mouse around (without pressing any mouse key) until you see the missing window.
  6. Press left mouse button on the desired place
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