When you add a text data field to a document, the placeholder text for the field is entered using the formatting attributes (such as font and size) active at the insertion point. You can then edit the placeholder text’s attributes to control the look of the actual data.
To change placeholder attributes, select the placeholder text, and then change the formatting attributes as you would with other text.
To change a placeholder, select the placeholder or the actual data, and select a different field name in the Data Merge panel.
To delete a placeholder, select the placeholder and press Backspace or Delete.