Google Mail Preview Pane: This method allows you to view both the inbox and the mail at the same time, Like the below image. To get this view just click settings in top-right corner and select Labs, Search for Preview Pane and enable it. And then click save changes at a top or in bottom of the page. After enable it you can change the view by toogle between other modes like No Split, Vertical Split and Horizontal Split. ---Geek Floor
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