I think this is a neat enhancement in Creo. With Creo 6.0 release, the Model Tree appearance can be controlled and configured by users
Setting Up the Model Tree
You can define the width of the model tree – add columns and keep the Model Tree column at the default width or the width you set.
You can Hide or Show columns for maximizing the graphics area. Toggling the visibility does not change the width of the Model Tree column
Default settings for Model Tree in Part & Assembly mode is shown as below. The out-of-the-box settings include Features, Suppressed objects and annotations that appear by default in the Model Tree. This is changeable.
Importing and Exporting Model Tree Settings
Model Tree settings can be changed and the changes are stored in creo_parametric_customization.ui file. Also, Model Tree setting changes can be exported or imported using customization file types (*.ui)
Resetting the Model Tree
You can use Reset to restore the default user or administrator Model Tree settings. The Model Tree settings are reset for the type of model on which you are currently working. For example, if you are working with a manufacturing model, the Model Tree settings for manufacturing models are reset to the default.
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Content source: PTC