I keep trying to record audio (guitar) but only 16 bars are recorded. I want the entire song recorded, then come back and lay other tracks (vocals) over it.
Grab the right end of the yellow bar and drag it to the right. The screen will start scrolling. Stop or drag it to the number of bars that you want. Look at the lower right corner of the arranger window for the zooms and the - + buttons to change the part on the screen that is viewed horizontally and vertically.