[Plugin: NextGEN Gallery] gallery appearance

I recently switched my WordPress site from one host to another and in the process lost the format or table in which my gallery formerly displayed. It used to fill the page from left to right, top to bottom.

Now it will only show up as a narrow line of images that run down the far left of the page.

I am pretty new to working in WordPress but have tried multiple ways to fix this with no success.

How can I change the way the gallery appears in my post?

http://laborofloveart.com/commissioned-art/

http://ww.wp.xz.cn/extend/plugins/nextgen-gallery/