If you have installed xenPorta style, you should disable parent style and set xenPorta style as default. Otherwise you will not see changes for portal.
Ideally styles structure should be like this:
Master Style (shown only if debug is enabled)
- Soft Responsive <-- style, not selectable by users
- - Soft Responsive - xenPorta <-- portal style, not selectable by users
- - - My Forum Style <-- child style where you should do your changes. you should set it as default and rename to whatever you want
View attachment 35246