Windows 10 Start menu typing

[Koko]

Hello,
This is similar to http://dexpot.de/forum/viewtopic.php?f=12&t=4257

On Win10 when I open the start menu and start typing (for search) it only works on desktop1.
If I am at another desktop, the moment I start typing the start menu disappears. I can find on Desktop1 where I can continue typing.

Thank you!