Changing the clef on a staff

Activate the  tools panel (using the mouse or the Alt+N hotkey).

• Press the button for the desired clef . If it is necessary to set the clef from the expanded list, press the arrow of the clef button , then select from the list.
  Move the mouse cursor over the desired position in the staff and press the left mouse button.

All measures from the current position to the end of the score will be affected by the new clef.