HTC One M8 User Manual page 68

68 Your first week with your new phone
To see more information, such as email previews and calendar
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events, slide two fingers apart to expand a notification. To
collapse it, slide two fingers together.
Some notifications allow you to take immediate action. For
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example, tap a missed call notification to return the call or reply
with a text message.
Tap the notification icon on the left to open the corresponding
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app.
To dismiss just one notification in the list, drag it left or right. To
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dismiss all notifications and close the Notifications panel, tap .