Android recommends your starting app size to be 864×864 pixels because it will make it easier to tweak the design if need be. However, the majority of devices will use 36×36, 48×48, 72×72, or 96×96 pixels. (Note that Android app icons must be saved as PNG files, not JPEG).
Read moreCan I change app icon size?
Go into Home screen. Select the Home screen grid or the Apps screen grid. You can change the grid size . App icons will change in size as they adapt to different grid options.
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