Problems with featured image size and meta

My featured images all display in huge sizes. The images are 640 wide but are cut off by a div.

I checked all my settings and used the recommended plugin to regenerate thumbnails but my website still shows the larger images.

My website:
https://acupoflife.nl/post-archives/

I’m aiming for something more in the likes of:
https://www.abeautifulmess.com/projects-a-beautiful-mess-diy-index.html/

https://www.ads-software.com/extend/plugins/genesis-grid-loop/