Hi
I understand your confusion it got me going for a while.
Once you have made any change under bar settings it only shows in the bar that you make the change.
When you look at the next bar you see no change (that’s because there is not, another change until you make one, later in the sheet.) In other words changes are from that point on.
Also there is a handy print summary button at the bottom left of the bar change window that will give you a text file of all bar changes in the song, this is very useful if you have a complicated song.
Mike