Graphic issues 2d project

Hi all. I'm new with Unity. And I have a very annoying problem. The graphics in "Game view" and on my smartphone are so sharp when I hit play Unity button. I try with Photoshop, Illustrator, downloaded icons from internet , change size, resolution, also I try SVG and so on , and so on and at the end the result is sharp graphic. I would be grateful if anyone help me .