The capability exists to work with several Instruments on one Chart simultaneously.
To do this you need to add one more instrument to your Chart, by clicking the Add overlay   button in the top left corner, near the Instrument Name. Select new Instrument for to handle quotes from both of them.

To set inactive instrument opacity go to Chart General Settings.

To activate one of the existing instrument click the Overlay button. In drop-down menu you can switch active symbol, remove or add new overlay.