How can I prevent a task from showing in the backlog if a subtaks is not DONE yet?
Hello,
You can not do it out for the box.
You would need a plugin for it.
For example, you could use the Power Scripts plugin:
https://marketplace.atlassian.com/apps/43318/power-scripts-jira-script-automation?hosting=cloud&tab=overview
You could add to your board's filter a JQL like this:
key in hasSubtasks("status != Done");
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