How do I change the UI back the way it was?

[AC Question]

The UI with the nougat update is a HUGE steps backwards, hard to read icons and more awkward. Text messaging conversation is the absolute worst.

 

[Ry]

The UI with the nougat update is a HUGE steps backwards, hard to read icons and more awkward. Text messaging conversation is the absolute worst.

What phone?

 

[Jamison K]

I also have a problem. With my S6