This probably could be done anyplace where the page items does not have the “Column Span” and “Label Column Span” properties enabled.
It would be nice to be able to remove the label similar to what we do when we set their column span to be zero.
I understand and value the need for a label in most page items, but there are cases in which they are self explanatory and the label actually takes unecessary space that could be used for something else.