Strapi is showing only the ID in a relation content type. I want to see the postalCode instead of the ID. What do I have to change/edit so that Strapi is showing me the postalCodes which I already entered instead of the IDs?
The option you are searching for is hided by the dropdown ;)
Select "Configure the view" or "Anzeige konfigurieren"
On the presented Screen you can then see under "Relational fields" your relations. Hover over the field you want to edit the display name and select it.
In the opened Modal window you can select the Attribute you want to use (highlighted in the screenshot)...
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