When this option is selected, Parts selected in the plots panel will be highlighted on the displayed model. Selecting multiple parts in the parts list will highlight all the selected Parts.
Using Alt+left mouse button you can select a part in the model view window and make it the current part. The part selected with the mouse will be selected in either the part list in the plots panel or parts panel. This is useful to identify parts and to make a particular part the current part active for zoning, filling or other part operations.
The default highlight color is golden yellow; you may alter the color and opacity of the highlight color that is applied to selected parts using the associated options panel.