How to remove a Flag from an item?
From the board, you should be able to toggle the flag.
You can also search for flagged issues via JQL.
Reference: https://support.atlassian.com/jira-software-cloud/docs/flag-an-issue/
Simple way is very similar to adding a flag. Right click on the story/task and chose "remove flag" and enter the resolution if necessary. Similarly follow the same process to add a flag.
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