See http://qt-project.org/forums/viewthread/32021/ for the initial support thread.
Tools => Options => C++ => Pointers and References; Tick only Type name and Left const/volatile (which makes the preview look like my preferred display).
OK => Apply/OK
This change did not seem to have any effect on how any code is autocompleted/formatted after pasting, pressing tab for autocomplete, etc.
Still uses the default positioning:
Restarting Qt Creator or the whole system did not fix this issue.