When you're looking at a report with many columns, to be able to get to columns beyond the first ones you have to scroll to the bottom of the report to then scroll across (unless you have a mouse that you can use the scroll wheel to get to the other columns or a touch screen for example) to see the other fields.
It has been suggested that it would be useful to have a horizontal scroll bar across the top of reports instead of the bottom/aswell. Whilst we've made this better by defaulting reports to only show 10 records, if users change this to 25/50 records it can be quite a long report to scroll down to be able to scroll across to the other columns.
Loom video for idea