This article describes how to use a rule to add the Column Names (by default A, B, C...) to the column headings in the table.
A crosstab table created in Displayr.
1. Select the table.
2. In the object inspector on the right, go to Properties > RULES.
3. Select the Plus (+) > Modify Headers > Add Column Names to Column Labels.
4. Click OK to apply the rule.