Hi @ines joly
Please go to this link and check what groups are added to "Administer Jira" permission.
https://{{your link}}.atlassian.net/secure/admin/GlobalPermissions!default.jspa
If you are not member of the groups that are listed under "Administer Jira", then you won't be able to edit workflows.
Hope this helped you.
Best regards,
Luka
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