You can change the page template for just this page to “Blank, no container, header, footer”. This can be done either from Pages > All Pages then hover over your page and click “Quick Edit”, or while editing in Pro by clicking the cog/settings icon at lower left. Then, edit in Pro and for the row containing your table, edit the row settings so that the Global Container is turned off. This will cause your element to take up the entire row from edge to edge. From here, you will be able to manually set the margin or padding on the row or the element.