The RadTabControl exposes an Align property of type TabStripAlign enumeration. It controls the alignment of the control's tabstrip. You can choose between the following options:
Left - this is the default value of the property.
Right - alignes the tabstrip from the right.
Center - centeres the tabstrip.
Justify - scales all RadTabItems so that all the available space is filled.
If there is not enough space available, the RadTabItems are arranged like Justify is chosen. Hence, parts of the items can be clipped. In such cases you can consider using multi-line tabs.