Improve use of screen space
For modest sized laptop / desktop screens, there is very little space left at the bottom for viewing the body of messages.
When using Opera, I could not adjust the size of the message list portion below a threshold.
Too much wasted space in the top bar (where the search bar & Home icon is). Similar point about the message-list frame, the 3 or 4 horizontal sections above it. I suspect the authors are working on high-res large monitors.
Also, make it easier to switch back to the previous version of Yahoo Mail.
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