The ACR 12.3 UI is a good accomplishment, but it will take some getting used to. However, I find the text size to be quite small throughout the UI (from the settings windows to the panel elements), particularly if I use a monitor resolution of 2560 x 1440 or higher. In Photoshop, the Interface Settings window provides a choice of 4 text sizes, and the biggest sizes help with this problem. Please include in ACR a settings feature that offers larger text sizes.
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