As reported by at
When zooming to a detail tab the configuration of "Single Row Layout" of the tab is not honored. It's always set to form even if it was configured as grid.
In a similar way I found that when zooming to a detail tab, the first tab is always set to grid mode even if is configured as form.
Committed a fix for both cases.
As suggested by I removed the two lines on AbstractADWindowContent.doZoomToDetail
Note those two lines were added as a fix for with the commit https://bitbucket.org/idempiere/idempiere/commits/7c5f2f0
I tested the case reported in and seems the two lines are not necessary at this moment.