Unable to delete index name

The following operation is my operation in kibana "Dev Tools":
Create an index called megacorp, then delete it with the delete index command: "DELETE /megacorp", and then use the query index command: "GET / Megacorp" to query that the index does not exist.
But why can you see it in "Managent" and "Discover"?
Although it can be seen in "Discover", it actually has no data inside.
How to delete the index completely, including in "Managent" and "Discover".

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