Hi Erik,
How the widget displays, is entirely up to the plugin/widget that you’re using, not the theme. The theme simply provides a space for the widget, and the widget itself, provides it’s own styling. Most sidebar widgets display left aligned, by default.
If you only add widgets into ‘Footer Widget 1’ on the Widgets page, then that widget area will take up the full width of the footer, but again, it’s completely up to the widget as to how it displays itself and whether it’s left or right aligned, or centered within that widget area.
As mentioned in my email to you, I can help you with the css that you need to use if you want to display something centered instead of left aligned, but you need to provide a link to your site so that I can see what widget you’re actually using. Without that, it’s makes it harder to determine what styles are needed to centre the content.