Hi Abhijeet,
the SAP Note 1884539 says:
On changing screen resolution, alignment of the fields/controls changes.
SAP Screen Personas and SAP Dynpro technology rely on absolute positioning from the top left corner of the screen. Thus, all the location information of controls is stored relative to the top left corner of the Personas frame. This allows the screen to look similar in most situations but prevents the screen from re-aligning content based on the screen resolution.
Most browsers such as Internet Explorer and Firefox support a manual configuration of a browser zoom level, the absolute screen resolution used to layout the screen can be passed to SAP Screen Personas using url parameters &width=XX&height=yy - this combination allows users to render even flavors created on high resolution screens on lower resolution screens.
Best Regards,
Julius Klingenmaier