Hi @Benjamin Gyuro ,
Thanks for posting and welcome to the community.
Is it a Next Gen or Classic Jira Project?
If it's a Next Gen project then it's not available there.
It's been discussed in another post I would request you go through for the article links in the answers - https://community.atlassian.com/t5/Jira-questions/Parallel-Sprint/qaq-p/1593318.
Could you please check and confirm if it answers your query? Please accept if it answers otherwise please respond and let others to share input.
Stay safe and healthy.
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