Can't optimize resolution for external screen

Hi,
I'm having a very frustrating issue with my Macbook Air running Yosemite. I want to use my 1080p external screen as the main one, but no matter what I try, my my mac optimizes for the built-in display resolution, not for the external one (which is therefore blurry). The weird thing is that when I close the macbook lid, the resolution is fixed. However I need to be able to use the built-in keyboard and touchpad, so need to keep it open.
Any ideas how to fix this?
My settings screenshot attached - with this I am not getting 1080p on my external display, but something blurry and scaled..
Thanks

Hello michalfromvimperk,
You may need to verify that your display arrangement is set for Extended Desktop rather than Mirroring.
Choose Apple menu > System Preferences, click Displays, then click Arrangement.
Open the Arrangement pane for me
Follow the onscreen instructions.
OS X Yosemite: Connect multiple displays to your Mac
http://support.apple.com/kb/PH19039
Cheers,
Allen

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