Hi Shreelakshmi,
You cannot change the resolution of the screen. Exactly what kind of problem you are facing? could you please elaborate well?
If you want to see your application in different resolutions using browser, you could press F12 or right click anywhere in your page and select Inspect to open developer tools. After this you would see following icon showed below.

After clicking on this Icon, you will be able to check behavior of your application in different resolutions.
Hope it helps, Thanks a lot.