Help to make Block Chords

New to program and am soooo excited. Not sure how to just make block chords that sustain. Also to change the rhythm of the chord in the chord…seems i must have four beats in one chord…would like to be able to have just one long sustained chord. If i do want to use the four beats, can a person change the pattern that seems preset? I am sure I am missing something very simple…I am not much of a musician at all…but hear things in my head and this will be a godsend to help me find the chords I need.

At the top you can find a button called “Band”. There you can select a different Instrument with sustained notes.