When you enable the classic UI (windows 10/PC UI) it makes the menus smaller and doesn't fit the screen properly. This bug also is present on my iPad Air 2 iOS 10.2.
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It makes it harder to tap on buttons because it is a lot smaller and it is wasted space. It is not so bad on my iPad because it has a big screen but on my iPhone 6 it has a smaller screen. It would be even worse for people with an iPhone 5/5s/SE with a 5 inch screen.
I believe this issue relates to https://bugs.mojang.com/plugins/servlet/mobile#issue/MCPE-19287
I believe this happens in all mobile devices.