Funny, I started this thread just a day ago.
The GUI way to stretch the status bar is a bit clumsy:
- In Settings, enable "Show playing widget" under "Behavior"
- Playback something, so that the now playing widget appears
- Right click on the widget
- Select "Show above status bar"
- Disable "Show playing widget" in Settings (if you don't want it)
Or just add
[PlayingWidget]
above_status_bar=true
to strawberry.conf