Right-click on the table and select Table Properties.
In Preferred Width, set the table width in pixels or percentages (100 percent being the full width of the HTML Help window, viewer, or browser).
In Preferred Height, set the table height in pixels of percentages.
In Alignment, select left, Center, Right. If you select Left, the Indent from left option becomes available, allowing you to indicate how from from the left side of the topic you want to align the table.
In Text wrapping, select None or Around.
In Table caption, select Above, Below, or No Caption.
To customize borders, click Borders and select the appropriate settings.
To customize shading, click Shading and select the appropriate settings.
To set margins, click Margins.