How can I remove field on Graylog 3.2

As attached file, I am newborn on Graylog server.
I created a lot of test field on Input Extractors…
When I delete the all of Input Extractors , but field still not deleted.
Can someone give a sample to teach me to delete those test fields.

Basic the delete not possible.
It list all fields what is in your log database. If it will be deleted by the retention settings, it will disappear.

I have successfully removed unnecessary items.
Thanks for your great help…

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