Using Kibana Console API does not show more than 10 Entries

Hello,

I am trying to figure out how to increase the amount of entries the Kibana API returns when I am querying Elasticsearch via the API (I cannot access the Elastic from outside, so I need to use the Kibana API).
I used the following URL to access my data (api/console/proxy?path=_search&size=50&method=POST), it yet does not show me more than 10 entries even though the hits counter tells me there are 28 entries. How can I solve this problem? We are using an Elastic 7.6.2

Best regards,
Anna