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You can change the TabControl 's TabPanel to DockPanel and set DockPanel.Dock="Right" HorizontalAlignment="Right" for the TabItem to make it in the right.
Step:
1.Go to the Document outline for the TabControl and Edit Template.
2.Change the TabPanel to DockPanel.
3.Set DockPanel.Dock="Right" HorizontalAlignment="Right" for the TabItems which want to be set left.
4.Run and get the result: