Set maximum resolution to 1080p

@amirm3hdi IMHO you should not do that. I wouldn't. If you stretch the textures that are designed to fill a 1920x1080 screen to cover a 2560x1440 screen, I believe that the loss in image quality will be noticeable.

So, I would either provide higher resolution textures suitable for 1440p, in which case the game wouldn't look small, or decide not to make the game available to devices with 1440p+ resolutions. FYI according to the latest available Unity Mobile Hardware Stats, 1440p devices account for about 1.8% of Unity games:

https://hwstats.unity3d.com/mobile/display.html