Why сamera preview does not match what I see on the device

Hello, I'm create 2d Game and here is camera settings

I wrote some script, that resize my orthoCamera. As you can see, in preview of game grid is 4x7. I use in preview 768x1280 resolution. Really grid is 6x10.

When i bulid this scene on device I see this

It's all my Grid! WHY? Is the camera must match the one that I see on the device?