Display language in windows 10

Hi, I've bought dell XPS 15 from Czech Republic, I'm from Slovakia. Laptop had already setted up Czech as main display language and I can't remove it from language list. I changed keyboard layout and add Slovak and English display language. I tried it via> Windows button-R>lpksetup>uninstall display languages, but Czech is setted up as default languge of user interface.

Is possible to solve this and delete it? 

Thanks