How to change the website interface's brown color folders to blue color folders?

Actual plan is Personal Professional but folders still grey-brown.

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@samirqlvdev wrote:

... i so like blue color folder interface how to restore blue folder interface?

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You can't. What you're seeing is an upcoming interface update. They're testing different changes with small sets of customers for quality testing and feedback. 

Please add choose theme color function, i think majority really don't like this new colors. Especially for a people who works with design files.