Kurt Shintaku's Blog

This is the START page on my Surface for Windows RT.  Notice anything different?

Four rows of tiles on a Surface for Windows RT Start page

What you need to do is:

1. Open the Registry via the desktop using REGEDIT.EXE
2. Create the following key[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
   CurrentVersion\Explorer\Scaling]
3. Create the following String value in this key:
   MonitorSize"="12.1
4. Reboot

Don’t fully know all the side effects of this change, other than the keyboard getting a bit smaller and the fonts looking a little less sharp.  You can however roll back the changes by removing the Scaling key.

More info here: http://support.microsoft.com/kb/2737167