I’ll add an excellent clearly explained graphic/text version from @dezmo
Follow this guide exactly after opening: Menu>>Window>>Preferences
- Hold down the ALT key. Hit SPACEBAR.
- Release ALT key
- 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)
- Hit one of ← ↑ → ↓ arrow keys
- Move your mouse around (without pressing any mouse key) until you see the missing window.
- Press left mouse button on the desired place