Click on the three dots on the top-right corner of the funder card to see options to Hide and Reset.
Hiding means that you're removing the funder card from your Pipeline AND making sure the funder does NOT show up in your searches anymore because you have deemed it unsuitable. For more information on Hiding funders, including how to Unhide, please check out this article.
Resetting means removing the funder card from your Pipeline. The funder will still show up in your searches.