Here are five steps to fix your screen size on Windows 10:
1. Right-click on your desktop and choose Display Settings
Using your mouse, right-click anywhere on your desktop to get a drop-down menu with several options on it. On this menu, choose "Display Settings." This is near the bottom of the menu, on top of the "Personalize" option. This option has a computer screen icon with a display window on it.
2. Click on Advanced display settings
Choosing the "Display Settings" option allows a new window to appear on your screen. This window provides you with several options for adjusting your settings. Scroll until you find the "Advanced display settings" option, which is typically at the bottom of the window. Selecting this option brings you to a new page.
3. Select the Resolution drop-down menu
After you choose the "Advanced display settings" option, you can select the "Resolution" drop-down menu. This is above the "Related settings" section. Clicking on this button presents a menu with various resolution values. The resolution value of your screen determines how large or small your screen looks on your computer. Typically, different monitors need various resolution values.
4. Choose the appropriate resolution value
Next, choose the appropriate resolution value for your screen. Typically, the resolution that fits your screen says "Recommended" by it. Select that option if possible, but if this selection isn't there, then you can choose the correct resolution by simply testing each value. When your screen looks like it's the correct size for your computer, then it's likely that you have the right resolution.
5. Click Apply and Keep changes
Once you select the correct resolution value, click the "Apply" button to confirm your changes. This option is directly below the "Resolution" drop-down menu. After applying the new resolution value, a new window appears on the screen that asks if you would like to keep your changes or revert to the original settings. Choose the "Keep changes" option to ensure that your new resolution value stays the same.