Ease Theme - Adjust Width of Front Page Cover Image

Hi everyone,
I’m pretty much a noob to Ghost and I picked the Ease theme because it looked the most easy to navigate, thinking I could “beautify” it to my desire but I’m running into a problem with the first thing: I want to adjust the width of my front page cover image. As is, it gets cut off (“overflow hidden”). It seems like it should be an easy thing to do and in other themes it seems to be but not in Ease.
Can somebody help me where I can even find the properties of the cover image?

TL;DR: I can’t find where I can adjust the properties of the cover image, help?