From the designer help: Show partial response hierarchies
If this option is selected, missing roots of partial threads will be created so
that response trees can be displayed for any message in the view. Otherwise,
only those threads which are complete can be displayed.
Note: These options are available only if your notes.ini file contains the
setting "Designer_ShowPropForJavaViewsUI=1." The default setting is not to
display these options.
None, although you can specify this setting in the NOTES.INI Settings tab of
the Configuration Settings document in the Domino Directory.
Designer_ShowPropForJavaViewsUI=0 / 1
Lotus Notes/Domino 8.0
Lotus Notes/Domino x.x.x