Hi Auerbach,
The easiest way to modify the look of a Blog page is through a Block Element – Content Template.
Here is an article you may refer to with regards to this: https://docs.generatepress.com/article/block-element-content-template/
Through this functionality, you should be able to design how posts will appear on your Blog/archive pages freely.
Hope this helps! Feel free to reach out if you’ll need further assistance with regards to this. 🙂