Hi Stefan,
T4-based templates provide separate profiles for each section of the template settings, such as Site Settings, Navigation, Layout Settings, and more.
It seems that when you create a copy of the default template style, any changes you make still affect the same profile, meaning those changes apply to both the original and the copied style.
To avoid this, go to the copied template style, navigate to Site Settings, and click the Clone button (located next to the Save button). This will create a new, independent profile for Site Settings that you can customize as needed. Once you’ve made your changes, click Save.
You can follow the same process for other settings in the template.
