The Outline View title bar contains a button  which enables switching between different previously declared sources. These sources themselves define different variants which can been seen in the Musical Score View while switching. See Musical Variants.

The Filter function  of the title bar is located in the downward triangle.

The Outline View title bar contains a button  which enables switching between different previously declared sources. These sources themselves define different variants which can been seen in the Musical Score View while switching. See Musical Variants.

The Filter function  of the title bar is located in the downward triangle.