Showing Cases of Opportunities in Subpanel

Hello there,

I have added the following field to "Cases":

Thereby, I can assign a Case to an Opportunity, e.g.:

If I now go to the respective Opportunity, I dont see the Case there because there is not Subpanel "Cases" for Opportunities.

How can I ensure, that Cases are linked properly with Opps and are visible in the Opportunity?

BR and many thanks in advanve

Alexander