when I write, I use BB for the composition of the song. if the factory endings don't give me what I want I simply add a bunch of measures to the song and make my own ending. For a hold and fade to black ending.... type the final chord followed by 3 dots. leave about 4 measures after it for the fade to complete.

G...

Normally, however, in the real world, you're not going to let the final chord sustain for 4 measures. So in my DAW, I use a volume envelope or envelopes (as needed) to shorten the fade to a more reasonable length.... normally about 4 beats and gone.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.