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Android Q brings material theme tweaks to the corners of the app switcher.

Google switched to a horizontal app switcher with Android Pie and now it is getting a very subtle tweak to ensure it follows the design language of Android and Google products. The corners of the application preview now has rounded corners and reminds me a lot about the cards seen around in Android. A tiny tweak, but one that makes the UI seem more polished. In Pie the corners were 90 degrees. This change also goes will with the rounded corners on the newer Pixel phones.