There is a registry hack out there. You would need to Google it. Not sure if it will work with CS 6 or not
Beyond that there isn't anything else you can do.
CS6 was not developed to work on high rez screens like the Surface 4 so you are out of luck.
I think that's the workaround with making a manifest in the registry. I tried doing that, but it's either not working or the program isn't recognizing the manifest. I tried several times to use that method, but every time I launch the program it either gives me an error of "Does not meet requirements" with something in regards to PhotoshopPortable, or it just doesn't scale (at least, I'm not seeing a difference in the scale).
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The registry change and an external Photoshop manifest file worked for me with several versions of Photoshop CC on my surface pro 3 so I could test with 1.25x and 1.5X scaling since Adobe Photoshop UI 2X scaling does not fit on the Surface pro 3 machine it would fit on a Surface Pro 4. The Manifest file I use was the same in all version of Photoshop. It would work with CS6..
Two Days ago new Windows 10 Preview build 15002 Microsoft enhanced its Display scaling. You can scale cs6 without a registry mod and manifest file. It is done with a setting in your CS6 shortcut use to launch CS6. This will be in the Microsoft's next major release of Windows 10.