Thanks for your fast reply.
Applying the negative padding almost works, but not quite.
The space appears to be removed (see attached Image03), however, this introduces another display issue.
When I hover the mouse over an item higher in the hierarchy, the blank space reappears and overwrites data in the grid (see attached Image04).
I imagine that this blank space that we are trying to remove with negative padding is created either by some primitive element which is hidden but not collapsed or by a positive padding value applied to an element.
Is there any way we can discover which element is causing the space to appear so that it can be removed more thoroughly?
Thanks for your help!