If you have Horizontal layout active, your music will scroll “infinitely” to the right — without any line breaks.
This can be handy on smaller screens or in various other situations.
Changing the layout
To switch to Horizontal layout, click the gear icon in the lower right and change the Layout to Horizontal:
Playhead behavior in Horizontal layout
By default, we’ll show you one “screen’s worth” of notation at a time during playback — but you can also choose to keep the playhead at the left of the screen and have the notation constantly scroll behind it. See here for how to change this.