How to make the panel scale into the SafeArea of Screen?

As the tittle said, how exactly make it happens? I mean i already tried but it didn’t work at all.
I try the tutorial from here https://www.youtube.com/watch?v=eVc79KdJTRk&t=709s but it didn’t work at all.

Press on your scene and scale it from there using the various scaling tools Unity provides