Style settings

Hello everyone, I'm a teacher and I've been making up worksheets by using this platform for a long time but with your previous version. I must say that the use of this new version is pretty friendly as well. However, I have problems with the "style setting"  - I want to use the "Speaking" element but at the moment I want to change the font, the size font, the background color, etc; I couldn't find how to do it. Can you help me with this?