Unity new GUI design 2D UI for multiple screens

Hello Experts, I am trying to design a 2D UI for screen ratio: 16:9, 16:10, 3:2,4:3,5:4.

I would like to know if it's possible that a group of UI elements' proportion doesn't change when I select different screen ratio, but when I resize the window, that group of UI elements will resize, too?

I tried to use Aspect ratio fitter, it only works when all the pivot points are the same. and if the pivot points are not the same, it works only under one screen ratio.

Please help!

Thank you very much!