Display Shrunked in Lenovo L192 Monitor after doing default factory setting

I have got some problems with the Lenovo L192 laptop monitor. Problem is that I recently did the factory setting in the monitor and after which I saw that the actual display shrunked and was about an inch. So I want to know that why this is happening after doing the factory reset.

I would like to know that what resolution you are getting in the monitor as the normal resolution for the 19” monitor should be the 16” width and 10” height. So I want to know that what resolution are you getting after doing factory setting.

After doing the factory setting I am getting display of 15.5” breadth and the height has been same with the 10” and current resolution I am getting is 1440 x 990, 60 Hz. So how can I get the display back to normal.