If you find the Adobe Illustrator CC 2014 or Adobe InDesign CC 2014 interfaces large and difficult to use, follow the steps below to adjust your display settings.
You can choose any setting less than 125% to have the same behavior as Adobe InDesign or Illustrator. To have a custom text size (DPI), select Set custom text size (DPI) and define the percentage value as required. For more information about this setting, go to Windows 7 Help and select To create a custom DPI scale.
Windows scale settings affect the overall Windows screen display. You can add an Environmental Variable value to control only settings for InDesign CC 2014 and Illustrator CC 2014—the overall Windows display will not be affected.
After the CC 2014 release of InDesign and Illustrator, these applications' user interfaces adapted to operating systems' scale settings. It used to trigger at >=125% with the user interface getting too large. However, with windows scaling less than 125%, it launches at 100% scaling, as in Illustrator and InDesign.