I have CS4, and ever since I started installing the program on my surfaces, the screen for the program is tiny. Everything else is normal size, and I have tried adjusting the actual screen settings on the main system, but it just blows up everything else while making photoshop larger. It also seems to affect all the other programs that come with CS4. Can anyone help me get them to a size that you can work with?
I hate to be the one to tell you this, but CS4 was released long before Hi Dpi displays. There is no way it will scale to your tablet.
I recommend Lightroom and Photoshop | Adobe Creative Cloud Photography plan for the latest versiopn of Photoshop that will work on your tablet.