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Mobile Portrait Default Width Problem on Designer

Hii~ I have one question that my homepage setting is 320px on mobile device.
How can I change my setting into 370px with iPhone6?
Please give me some advice.
THX alot.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

You might want to look at this university article. It should clarify the issue and solution for you.