Welcome to the forums @AgeOfAsparagus!
I’m not sure if there is a way to change the cursor in Godot. I think you can override the cursor image for a project, and there might be something similar in the Godot editor project settings, at least that is where I would look.
If you cannot find any settings, I might recommend making an issue on GitHub, if one does not already exist (please search first), as Godot should ideally just work with the cursor regardless of its size.