You can change the appearance of the message list and reading pane in Outlook. Email in the message list can be displayed as individual messages or grouped by conversation.
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At the top of the message list, select Filter.
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Select Sort and choose how you want to sort your email.
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At the top of the page, select Settings > Mail > Layout.
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At the top of the page, select Settings > Mail >Layout.
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Under Focused Inbox, select either of the options depending on whether you want to focus on certain mails or not.
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At the top of the page, select Settings > Mail >Layout.
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Under Message organization, choose either of the options depending on whether you want to show email grouped by conversation or as individual message.
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If you select Show email grouped by conversation, under Arrange the reading pane, select either of the options: Newest on top or Newest on bottom or Show each message separately.
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Under Reading pane, select one of the options depending on how you want to display the reading pane.
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Under Message list format, select one of the options depending on how you want your messages to be displayed.
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Under Message reminders, select one of the options if you want to set message reminders.
See also
Change the look of your mailbox in Outlook.com and Outlook on the web