How to Add Preview Pane or Reading Pane in Gmail
After logging into your Gmail, click on Gear icon appearing at the top right corner | Settings
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Click Enable | Save Changes
You have now enabled Preview Pane in Gmail.
Using Preview Pane / Reading Pane in Gmail
After you enable the Preview Pane Gmail Lab feature, you can see a toggle button appearing at the top right corner, just beside the gear icon. There are two options: 1) Vertical Split 2) Horizontal Split to preview the messages. You can switch between those two by toggling the preview pane button.
When you use Preview Pane Gmail Labs feature, an email message is set to be shown as Read after a delay of 3 seconds (previewing it). You can change this settings: Click on the Gear Icon | Settings | General | scrolldown and look for "Preview Pane: Mark a conversation as read:" | Save Changes.
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