I’m not very familiar with themes in general unfortuantely, there is so many of them, but I am more than happy to suggest.
I think you may have it in the right position, it may only need a bit of adjustment. If you turn off the compact layout, then I would change the search bar width to a fixed 230px, and the results width to 320px for mobile and snapping to the right side, and that should give you a layout very similar to this.
