Hi mbmtsv
I got your point, if you duplicate template style, you should clone the layout to have a new layout and use it for the duplicated template style:
![](https://www.joomlart.com/forums/assets/files/2020-12-14/1607939696-309959-screen-shot-2020-12-14-at-165303.png)
At this moment, you use 'Header-1' layout for both template styles so when you edit the layout, it will affect both styles.
Regards