Set column markers opens the "Set column markers" dialog where you can define column marker groups and the column markers to be actually displayed when the group is active.
Column groups
In the column groups list, you can select a group name by clicking on it and edited it by clicking on it again. This allows column groups to be assigned unique names. This list has four associated buttons:
Column Markers
The Column Markers list consists of two separate columns, Enabled and Column Number. When a column group is selected in the first list, the column markers associated with that group may be defined within the lower list.
When a column marker is created, a checkbox appears in the Enabled column. You can enter a column number at which the marker should be displayed in the Column Number column. The column marker is only displayed if the Enabled option is checked. In the column markers list, you can select a column number by clicking on it and edit it by clicking on it again. This list has three associated buttons: