Featured Image Size in Blog

Dear Community!

I am struggling with the size of the featured images in Unicorn.
How do I reduce the size of it? (its just tooooo big and taking all of the space)
I have already tried to reducing the resolution and that just made the image quality poorer – without reducing the actual shown size.

Example:

Work at the Vervet rehabilitation center

Thanks a lot in advance.

Best
Michael

Ticket