You open this dialog box by first selecting Nodes with more than specified number of fan-outs: <n>
or Top nodes with highest number of fan-outs: <n>
under Timing closure in the Design Assistant rules list in the Design Assistant page, and then clicking
High fanout Net Setting.
Allows you to specify the number of nodes you want the Design
Assistant to report when you turn on Nodes with more than
specified number of fan-outs: <n>
or Top nodes
with highest number of fan-outs: <n>
in the
Design Assistant rules list.