Remove all existing connectors before adding a new connector scenario

Enable the option to remove all existing connectors on the affected panels before adding the required connector, so the new scenario defines the panel's connector set cleanly.

1. When editing or creating a connector scenario, first enable the option to remove all existing connectors on the affected panels, then add the required connector.

2. Removing all existing connectors clears previously applied connectors so the new scenario defines the panel's connector set cleanly instead of stacking on top of old ones.