I’m new to the forum and relatively new to Blender. I have a very simple mesh that I divided by separating it in different objects (with “P”). My problem is that i can see the borders of the new different objects. Can that be fixed somehow or is it just the way it is?
Perhaps you’d like to tell why you want to separate them ?
Anyway, the reason why it looks like that is because vertex normals on those edges now point to different directions and that cuts the shading. There are no tools in Blender that would allow you to adjust those so that the shading would make them look like uniform mesh again.