When manually routing a PCB, it often difficult to find a path because the un-routed track segments from other nets obscure you vision; You cannot 'see the wood for the trees'. This video on the right shows you how DEX solves this problem by using auto-dimming and auto-hiding.

If the button is checked and a net/track has been chosen, then all unrouted track segments on all nets are hidden except for the chosen net/track.

You can chose a net/track by:

•Clicking on the net in the viewport or

•Click on the net’s row in the Route Panel.

If unchecked the all unrouted track segments will be visible if no net/track is selected.