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People always have been looking for a ways to change the display size, either magnify all elements or shrink all elements. So far, the only way to do that was by rooting. Now, Android (Nougat) gives the Users the ability to Magnify and Shrink all the elements on the screen without any hassle. Just follow the Method. To access this new feature, head to Settings > Display > Display size.
Note: This Method currently works on Android 7.0 aka Android Nougat only.