treecombobox DropDownWidth property
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Applies to
acTreeComboBox component.  

property DropDownWidth: Integer;  

The DropDownWidth controls the width of the drop down window, when can be visible when user clicks on the TreeComboBox control or its button at the right side.  
By default the width of drop down window is the same as the width of control (when the DropDownWidth equal to Width and you resize the control at design time, you will see that DropDownWidth will be changed accordingly to Width of control). But of course, you can modify this value, if you wish to make the width of popup window different than width of contol.  

See also
DropDownCount property.