Design studio customizing controls

[Seba the student]

Hello,
I've watched the video https://www.youtube.com/watch?v=Ed8WS03C-Vk that shows how can I change the color of a slider, but actually, in my design studio there is no shuch option available (or I can find it), how can I do that without typing additional qml code (from the design sudio GUI) ?

[BrookCronin]

Customizing Controls is a complicated topic. I would personally always use the File Wizard Control Templates, they are the easiest to customize as a Designer.