I created a new board, using the option to Create from an Existing Project. Now I want to delete it because I did not realize it brings all existing issues with it. Is there an option to hide or remove a board?
Yes you can delete the board you just created (assuming you still got the correct permissions to do so).
What do you mean by "I did not realize it brings all existing issues with it"? A JIRA Agile board allows you to display, manage and work on project issues based on a filter of your choice. No other side effects on the JIRA Project itself and the issues on it.
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