There’s the Totallee thin cases which are the thinnest case you’ll probably find, and may give the illusion of reducing the bezels that are bothering you. The other option is a leather case that wraps around the screen a bit in a black colour option, Mujjo do one for the regular 11 similar to the one that Apple sell for the Pro models.
However, if you’ve only recently bought the phone then chances are you’ll adapt and start to not notice it very soon.