Inkscape sometimes opens the “Documents Properties” window outside the visible area of the desktop on Windows.
If this happens:
- Press Conntrol+Shift+D and then ALT+space to open the context menu of the “Documents Properties” Window
- Use the “arrow down” key once, to select “move” from the context meneu
- Hit “Enter” once
- Now use your arrow keys to move the window. It should snap into the visible area.
This solution works for Windows only.