It would be useful if conditional visiblity was added for the columns of a layout grid.
So it used to be that a layoutgrid would need to add up to 12 in the old Bootstrap based system but since Mendix moved to the flex based Bootstrap system this is no longer the case. However support for conditional visibility on columns was never added. I think this would be a nice addition, espcially since hiding the content of a column can often result in extra spacing when "spacing between columns” is checked.