How to remove date grouping/headers/separator in Outlook?
By default, there are date groupings, headers, or separators such as Today, Last Week, etc. in your Outlook mail list to organize emails. However, if you prefer a plain view, you can remove these groupings. Here's how:
Remove date grouping/headers/separator by unchecking the Show in Groups
Remove date grouping/headers/separator by grouping items by none
Remove date grouping/headers/separator by unchecking the Show in Groups
This method removes date grouping from a specific email folder by simply unchecking the "Show in Groups" option.
1. Switch to the "Mail" view and open the desired folder.
2. In Outlook 2010/2013: go to "View" tab > uncheck "Show in Groups" under the "Arrangement" group.

In Outlook 2007: click "View" > "Arrange By" > uncheck "Show in Groups".

Alternatively, click the "Arrange By:" section above the message list and uncheck "Show in Groups" via right-click.

Once unchecked, the mail list will display all items in plain view without date headers or separators.

Remove date grouping/headers/separator by grouping items by none
This alternative method disables date grouping by explicitly setting grouping to "None".
1. Open the target email folder.
2. In Outlook 2010/2013: click "View" > "View Settings".

In Outlook 2007: click "View" > "Current View" > "Customize Current View".

3. In the "Advanced View Settings"/"Customize View" dialog, click "Group By".

4. In the "Group By" dialog:
- Uncheck "Automatically group according to arrangement".
- Select "None" from the "Group items by" drop-down.
- Click "OK".

5. Click "OK" again to close the settings dialog and apply the plain view.
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