Report Painter > insert blank line after report header

Hi Expert,

I have a problem to insert a blank line (a spacing) after the report header of my customized report painter.

For example, in standard cost center report, S_ALR_87013611, there is a small box listed information like cost center/group ... and reporting period.

Right after reporting period, the report header box ends, and there is a space line between it and the cost element data ...

For my customized report painter, I cannot make this space line.

I tried edit > row > insert blank line ... but not successful ... kindly advise.

Thanks and regards,

-CK