Select Options® Vertical grid to display vertical grid lines appear in the events area of the planning board.
How often the grid lines appear depends on the way the Grid density option is set. If you choose a Grid density of Coarse, the grid lines mark the boundaries between the time units shown in the upper level of the time line. For example, if you are using either the Days or Weeks time unit, grid lines appear between months. If you choose a Grid density of Fine, the grid lines appear more often.