Objects on your Stage, even symbols, can have different transformations applied to them. Transformations such as Scale, Rotate, and Skew are applied with the Free Transform tool. (See extra bits on Page 30.)
Confirm that you're still editing inside the background symbol. If not, double-click the symbol on the Stage to enter editing mode. Click to select the line & logo layer in the Timeline.
Choose the Selection tool to set the transformation.