This is only visible if you were the person to create the list.
1. Find the list on the app that you are wanting to get rid of.
2. In the top right corner of the list is a pencil icon. Tap on it.
3. There will be an option to Delete List Instance.
a. If you do not see this option then you will need to delete it from the back end.
b. Refer to the article Deactivate List Instances | Browse Lists to learn how to do this.