Hello Sharron! Thanks for reaching out to us. I'm afraid that there's not an option to disable this call panel. It was part of the changes added to the recent One UI 3.0 update. We appreciate you taking the time to let us know your feedback on this change. We will make sure to pass this information to our developers team so they can take a further look into it. As well, if you haven't done already, you can post your feedback in our Samsung Community (https://t.co/shGtjMmyaf) so it can be tagged with other feedback and requests that are seen by Samsung product groups and taken into consideration for future updates. ^Yoel
Thank you for your interest in sharing your ideas with Samsung. We appreciate your feedback and will tag it on the forum so that it will appear with other feedbacks, ideas, and requests. This will allow your post to be more easily found in the event that Samsung product groups are seeking outside feedback/requests/ideas regarding our products.