1 | initial version |
There's no setting involved there.
Unless there's a bug somewhere in the GUI code, the horizontal scrollbar should be there if, and only if, the data in the packet list is too big to fit in the window.
If, for example, there's an "Info" column value that's really long, that might mean it won't fit in the window unless you make the window really wide (assuming your screen is even wide enough to make it that wide). The same applies to a display with a large number of columns.
If, however, you don't have a lot of columns, and the information in those columns, including the Info column, isn't very long, so that all the columns fit in the window, there won't be a horizontal scrollbar - it would take up extra space, and wouldn't actually be able to scroll, as there's nothing to move.