Lengthening fade to black in iMovie on Mac
So, I'm trying to lengthen the fade to black in iMovie 10.4, on a M2 MBP 14". The fade to black in Settings is a quick simple thing that doesn't do what I want, so I'm using the Fade to Black Transition at the end. I just want a slower fade out. I go to precision controls, but no matter what I do, the fade out is pretty much the same, and the remaining time that I add is just a longer blackout. It seems strange that there are controls for precisely editing the fade to black, yet they don't seem to do anything when you extend it. It's very weird. I took a short video where it clearly shows the fade really quick, and not following the fade line I stretched out at all. What's the fade line for then?
MacBook Pro (M2 Pro, 2023)