Hello Alex,
thanks for replay.
I use orbeon 4.0.1 in Chrome.
I just tested in 4.3 in Chrome. The icon "i" for section help shows only in preview window. But in 4.0.1, it immediately shows near to the section title.
Here are some screenshots:
if you click on the "i", dann it looks like this. Show label editor instead of openning help dialogbox