The Photoshop team welcomes your feedback on this experimental feature. Let us know what you think! — Photoshop user interface controls may appear small and hard-to-read on high-density displays. Also, on touch-enabled screens, you may have trouble clicking the smaller controls. 200% scaling solves this issue by doubling the size of the user interface.
Since the user interface elements increase in size by 200%, depending on the size and resolution of your display, you may need to adjust the layout of existing workspaces. For example, on a 1080 px screen at 200%, the Tools panel extends off the bottom of the screen. You can change to double-column orientation in order to fit the panel on the screen.
Note: This feature is only for Windows users. HiDPI on Mac has been available for high-density Retina displays since Photoshop CS6.
You may encounter some cosmetic issues while using this feature. While many Photoshop dialogs have been reworked so that they fit on the screen at 1080 px, viewing some dialogs (such as Smart Sharpen) completely may require you to collapse sections.
Disable 200% UI scaling
If you need to return to the default 100% scaling, do the following: