Click (Geometry tab > Feed System panel > Move Runners). The Move Runner dialog appears.
Position the cursor over the end of the detached runner, and click and hold the mouse button when the intersection changes to yellow.
Move the runner away from the attachment point and then back again until the intersection point changes to yellow again, and then release the mouse button.
Click (Home tab > Analysis panel > Pre-analysis Check) to perform a runner system pre-analysis check. Once complete, the pre-analysis report either confirms that no errors exist, or highlights the problem areas of the model and displays a message which explains any actions required.