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This is how Custom header/footer setup will look like.
Select this Report Header in the Report Builder and make sure that the checkbox before it is checked when printing/previewing the report.
Here's how it is shown when report is previewed/printed. Highlighted section is the Custom type header/footer. Since this is a report header, this will show on the first page of the report only.
You can enhance this header/footer by setting its Font Properties and Row Height. See How to Configure header and footer font properties and row height topic to guide you on how to do this.
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