Turn off the mysterious feature in Windows 10 where all windows disappear when you shake a window while dragging it with the mouse.
From Control Panel\Ease of Access\Ease of Access Center\Make the mouse easier to use,
Check “Prevent windows from being automatically arranged when moved to the edge of the screen”.
Click Apply and OK.
Reference:
- [【Windows】マウスを振ると他のウィンドウが消える機能をオフにする | TeraDas-テラダス](https://www.teradas.net/archives/20665/)