Andoid App
You have crammed everything into a single menu at the top-left of the phone screen. I am not sure why, but the pull-up option that used to be at the bottom of the screen was much more efficient. This was especially true when using the phone one-handed. Now, I have to sift through a mess of options in one menu to get to the folder I need. I jump between folders all the time for personal and work topics. I am not sure why you have decided to make the app the same as Outlook and Gmail with one menu. Yahoo was unique, and now it just feels the same. It's disappointing.
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