Also, if you didn't discover yet, you can use the arrow keys to unfold the different files and sections. Then select what you need, split the rest to new commit.

As you know, even when just using the most basic functionality (new changes, merges, rebases) of jj, it's amazing. But then you just keep discovering other features and workflows - none of which require any incantations - that make it that much better. And I'm sure I'm still only scratching the surface of its possibilities.

And, as I keep saying everywhere, jjui just takes the whole experience to another level.