Hi there!
We only communicate in the English Language. Please help us understand your issue by translating it!
However, You need to put the intro text in your Joomla editor, add the readmore pagebreak there and then move on the SPPB editor and save the article. You can continue adding contents with SPPB editor now.
On listing page the content will come from the default joomla editor. It's joomla's feature not ours. https://prnt.sc/jzhx42
https://prnt.sc/jzhzqr
But your page builder content will appear only when you click on the articles. I mean in the details view. https://prnt.sc/jzhxq6
Hope you understand.
Best Regards