Due to how multiple screen painting works and how Windows doesn't rotate things, it wasn't possible to support vertical monitors in multiple monitor mode, but it should in single.

From the screen you posted, click the 'Launch KVM connection screen' button.

Connect to your Secondary with the vertical monitor. 

Click the cog icon at the top of the KVM connection window, then 'Show remote monitor', then just the vertical monitor, not 'All'.

Sean Drohan
Stardock Product Lifecycle Manager

That is not being asked of you - you can still get to other monitors, just 1 at a time. 

Again, this is not a choice or neglect, its a limitation that Windows itself creates.  If we can ever get around it in the future, we certainly will. 

Sean Drohan
Stardock Product Lifecycle Manager

heres the image of it, 

theres huge dead zone Black one - and mouse is unsuable as in my gif (mouse is mirroring from black part to actual remote desktop showed in image )

and exacatly the same thing happens if i switch to screen nr 2, same black bars

guys