The cell border lines in the current Cross Table visualisation are so pale it's hard to see them (on either the dark or light visual themes). On certain screens (especially projected) you cannot even see the lines at all, which is not helpful when you have a table with lots of columns.
Unless I'm mistaken there is no way to change these. It would really improve the clarity of the table (easier to read) and improve formatting flexibility if these could be changed to the users' requirements.