Why does my table heading butt up against the top border of the table?

I've created a one-cell table that is acting as a section heading in a quick reference guide.

The problem is that the heading text butts up agains the top border of the table, as shown below.

I've tried changing the cell margins in the table designer, and changing the spacing options in the paragraph designer.

Or is there a better way than a table to accomplish this heading?

How do I fix this?

Cindy