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From the Relationships → Trunk Groups All, Disabled, or Enabled window, find the Trunk Group to be edited. Find the Trunk Group to modify in the main window and move your mouse cursor to the right of the STATUS field for that Trunk Group. Left click on the three vertical dots that appear and the select Edit.
From the Relationships → Overviews → Trunk Groups window, click on the Trunk Group name in the NAME (ID) column.