Can’t delete Custom Form Field

I added a custom form field which I need to delete, but when I click the dropdown I can’t edit or delete it. How can I remove please? Think it broke as I added </br> code to try and make the label go to new line. Screengrab link below. Thanks

https://drive.google.com/file/d/1iM9rFpR8ss3x00OdjLpFqib3G7K_1YN8/view?usp=sharing