Model-Based Definition > Model-Based Definition > Working with Model Properties > Materials > Controlling Material Display on the Model Tree
  
Controlling Material Display on the Model Tree
The modeltree_show_materials configuration option controls the display of material on the Model Tree. The default value of this configuration option is Yes, so materials are shown on the Model Tree by default. However, if you set this configuration option to No, the Materials checkbox in the Model Tree Items dialog box is unselected and the material is not displayed on the Model Tree.
 
* Close the model and open again to view the changes.