Github user rstjohn commented on the issue:
https://github.com/apache/nifi/pull/1334
Unfortunately, the browser is not zoomed when this occurs. The issue is
far more convoluted than that. It appears that the issue is related, somehow,
to the nginx reverse proxy issue. The delete button is missing only when the
nginx proxy is used. If I connect to the NiFi cluster without the nginx
reverse proxy, the button is visible and functional.
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