How To Change Category Page Layout

Hi, Just wanted to start off by saying that the Catch themes are amazing! I was previously using another theme which didn't offer much in terms of flexibility and built in theme options. It has been so much easier since changing to Catch themes! I have set up my website so that categories are listed in the menu bar, and clicking upon a category shows all the posts which have been tagged under that particular category. I was wondering if there is a way to change how those posts appear? I know that I am able to change between displaying the full post and just a preview. Am I able to change the layout, such that each post appears in a box? Maybe with the thumbnail on the left and the preview text on the right next to it? Where the image and the text appear don't really matter too much, but I would like each post preview to appear in a box so that each post looks a little more distinct. I'm not sure if this is a setting/option I need to adjust or a code I need to add in. Any help is greatly appreciated! Thank you in advance!