Parallels 10 Windows 10 Preview full resolution?

Problem:
how to get full resolution for my iMac 27" and my Macbook Pro 13" Retina?
When I do an upgrade from Windows 8.1 to Windows 10 in Parallels 9, I do get
the full resolution of the monitor, why not in Parallels 10 and Windows 10 Preview
fresh installed? 1920 x 1200 is useless for me! Any tips? Thx!

 

Hi Hans-JoachimG,
Please follow the instructions given at http://kb.parallels.com/119926 and check how it goes.

 

hi Manoj,

thx for your tip! For now, I decided, not to go for the spyware system, due to the Eula:
http://www.techworm.net/2014/10/microsofts-windows-10-permission-watch-every-move.html

I'll hope, they change their Eula at the final Win 10!