[GNC] question on reconciliations

[gnu at 2manymonkeys.com]

I have been using gnucash for some time and just upgraded from v3 to v4

 

On reconciliations under v3, when I had an offsetting transaction and I
cleared one side, it would automagically mark the offset as well (they were
both sub-accounts under the primary account).

 

V4 does not seem to be doing this. Am I missing something? Have I screwed up
and need to reinstall clean? Has this process changed?