Hi,
Thank you for the details. I tried to check on the given URL, but unfortunately it requires login information to access the page.
In case you are using the filter to redirect to the results page, then editing the theme files (or via the theme builder if there is any) is the only option. The plugin only passes the results to the results page, but it cannot affect their field contents – it is basically parsed and printed by the theme.
If you mean the live results list under the search, then it should be possible. At first, you will have to increase the description length to a high number, like 99999 characters, so it is not cut. Then on the advanced options, change the primary content field from excerpt to post content. You can also use the advanced content field to include some text based custom field values within the content.