Hi folks! The update of October 17, 2017, included high DPI aware UI scaling. Since many of you seem to have questions and thoughts about this, we invite you to use this thread for your feedback.
Here's a brief description of how it works: macOS and Windows provide a UI scaling value, usually based on the monitor resolution and dimensions. As of Tuesday's patch, we use this in the 64-bit client to scale the in-game UI as well. You can change it in your OS settings, but each OS version will have the setting in different places so please consult your favorite search engine to determine how to change that setting, if you wish to do so.
We do want you to know that we are aware that there have been crashes related to this feature, and we hope to have fixes for those very soon. In the meantime, please share your other feedback in this thread.