Charts - when clicking on the data points, the pop-up table doesn't have a horizontal scroll bar

I have created this report:

When clicking on each datapoint, there is a possibility to add a series of columns to the pop-up table (this is in the editing mode, in the report):

But once I go into the viewing mode of the report (ie in a dashboard), not all the columns are visible, the horizontal scroll bar is missing.

Thanks!