When your Bookmarks are all prefixed wit some text (i.e. Chapter 10: LPC408x/407x Ethernet) and only the right part (i.e. "Ethernet") is significant, you have to make the bookmarks pane very wide in order to be readable. Reproducible: Always Steps to Reproduce: open a NXP user manual, i.e. http://www.nxp.com/documents/user_manual/UM10562.pdf
Created attachment 90079 [details] Bookmarks are useless
Created attachment 90080 [details] unless the bookmarks pane is very wide
Hm, but then the page numbers would scroll out as well.
Then the scrollbar should only apply to the first column of the tree widget. But I am not sure if QT supports this.