3. When you are done changing the screen’s resolution, click OK to save the changes. You may need to confirm the changes. If so, click Yes to continue.
Note: If you are uncertain about which resolution to choose, click Apply instead of OK to view the changes. You will have 15 seconds to save the changes before the screen resolution reverts to its original state.
If you are not satisfied with the selected resolution, simply repeat the previous steps to set the resolution that desire.