Thank you for writing.
By "@media min-width320px"
do you mean the selector inside the kendo.mobile.all.css
file or something else? If the selector, you should be able to manually change the value from 320px to 640px.
However, I would kindly ask you to elaborate a bit more on the issue as it is not clear enough what you are trying to achieve. Thank you in advance.
I am looking forward to your reply.