afni.nimh.nih.gov

That does not seem like it is showing the current
parameter, but rather the default value for a new
clusterization operation.

Setting Bi-sided to Yes in the Clusterize plugin
does have that effect. But when clicking on
Clusterize again, it still shows "No", because
that refers to the next clustering that you are
about to do, but haven't yet done.

- rick