Thank you for your interest in RadTabControl.
Changing the position of the AdditionalContent property is not supported out of the box. To do that you can extract and edit the default template of the control. In the Editing Control Templates
help article you can read how you can extract the default templates of the controls.
In your case, in the extracted template of the control, you can navigate to an element (telerik:LayoutTransformControl)
" and set the telerik:RadDockPanel.Dock
attached property to Left
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