Hi @frankralfano ,
You need to replace the palmrest assembly.
Here’s a link to the [https://topics-cdn.dell.com/pdf/xps-15-9550-laptop_service-manual_en-us.pdf|service manual] for a Dell XPS 15 9550 laptop taken from this [https://www.dell.com/support/home/us/en/04/product-support/product/xps-15-9550-laptop/manuals|webpage]
Scroll to p.87 to view the necessary pre-requisite steps and then the procedure to remove/replace the palmrest assembly.
Replacements are available online. Just search for ''Dell XPS 15 9550 palmrest assembly'' to get results for suppliers of the part.