Hello @Anna-Lena Becker ,
The Issue Key is the base unique identifier for issues, and the central design element of issue mappings which is centered around the issue key as the primary source of truth of what issue is in focus, as such, it's not possible to hide this information on the Roadmap view and is used to distinguish individual epic issues from others that have either the same name or similar names as other epics.
The only place where it's possible to hide the issue key is on the Filters > Advanced search, but will still relay the Key for all linking operations when viewing additional details from this location. Other features don’t allow you to remove or hide it as it is the key identifier of the issue you are viewing throughout the system.
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