Judging by the lowest layer of clouds, the corn field is not flat. It is a little dark in the foreground, and there isn't much of a subject to look at, besides corn fields.
The horizon may not actually be level since it's land.
Water is level as a horizon, though if far enough from the camera can be a curved since the Earth is an oblate sphere.
What does that have to do with you trying to figure out how to use lightroom?
What is it that causes you a problem in lightroom?
I don't think that my telling you that you have a great shot will help you with any of your future edits. But I think the picture is interesting, love the lighting and the beautiful clouds.