Welcome to the Atlassian Community!
By the screenshot you provided, you have configured the Story swimlane and need to customize which fields you want to hide/show in the swimlane.
Unfortunately, it is not possible to customize the fields in the swimlanes, however, we created the following feature request to allow this customization:
Feel free to vote and watch the suggestion to increase its priority and also receive notifications about any updates.
Let us know if you have any questions.