Accidentally minimizing all windows while dragging a window?

While dragging a window on the desktop, a common annoyance is that it sometimes minimizes all other open windows. This "feature" happens if you accidentally shake the dragged window, and can be undone by shaking that same dragged window again.

For a more permanent solution, click the "Start/Window" button > Settings > System > choose Multitasking (left pane) > Disable "Snap Windows".

Alternatives:
Use the "Show Desktop" tray applet
Use keyboard shortcuts: to minimize all windows: Win+M, to restore all minimized windows: Shift+Win+M