Set Windows text size
There are numerous ways to access settings in Windows, and everyone has there own way. Two fast ways to access Display settings, one is to right click on the desktop where the is no open application, or icons. A menu will open, locate and select Display settings. Another way to open Display settings is to select the Start menu, then the Settings gear, then System.
Display settings scale and layout
The scale settings is sort of like zoom for fonts. It allows you to make fonts, and other elements larger without changing the entire windows and all its elements in size. The effect of changing the scale is immediate, and can be seen right away. If the fonts are too large then select a lower setting. Some applications do not do well with scaling, so it is best to set a scaling percentage, and then open applications you use to see if everything works properly. Some applications may not show the font properly, or may block some of the text. Choosing a setting of 125% or 150% does not tend to cause issues with applications, and therefore are the recommended scaling percentages to use. At higher resolutions such as 4K Microsoft recommends a setting of 300% which is too large as seen pictured below.
Steps 1 and 2
Click on the Start menu. Then click on the Settings icon, it looks like a gear.
Set scaling percentage
To quickly open Display right click anywhere on the desktop background image. Then select Display settings near the bottom of the menu.
Select the drop down arrow to adjust the Windows system scaling or DPI (dots per inch).
Lowering the Resolution which we are not doing here can enlarge fonts as well. However, this effects the entire screen, making everything larger and offering smaller overall work space, and therefore it is preferred to use Scale and layout when possible. However, some times changing the resolution, and scaling produces the desired effect.
Select the preferred scaling from the list. The setting will automatically preview. If it is too large simply try a different setting.
The Recommended setting of 300% is too large and is not recommended. The recommendation Window's suggests varies depending on the monitors resolution.
It may not be visible right away but settings above 150% can cause fonts or text not to display properly with certain applications.
Sign out now (optional)
Be sure all applications are saved and closed before clicking Sign out now.
This may be done later, and is not required. Simply restart when ready to be sure all applications are using the new scaling setting.
If you have more than one monitor you will see the additional box with the monitor numerically represented. Each monitor that needs adjusting must be selected by clicking on the numbered box, and scaling set.
The dark highlighted monitor #1 is the currently selected monitor.
The #2 monitor is smaller because it's resolution is 1080p, monitor #1 has a resolution of 4K, or in this case 3840 x 2160 four times the size monitor #2. That is why the image is one quarter that of monitor #1.
Other Display settings
Blue light is emitted from modern screens and it can lead to digital eye strain. Reducing blue light emitted from the screen can help. Microsoft has implemented a technique the called Night light.
Night light is designed to lower the blue light emitted from monitors. Blue light is said to affect sleep patterns by reducing melatonin.
If you are using your computer at night and having trouble sleeping give it Night light a try.
Night light settings allows you to adjust your monitors color temperature when Night light is on, and to set a schedule.
HDR and advanced color
HDR and advanced color will only show if your monitor supports high dynamic range. Windows 10 tends to flatten and darken images when HDR and advanced color is enabled. If you have the option it is as simple as turning it on, and seeing if you like the results. With time Microsoft should be able to improve the results.
Orientation is to allow for screen rotatation. It is the same setting as when printing, the choices are landscape, and portrait. Most consumer monitor stands do not allow for this. However, if your screen is ever rotated 90 degrees then Orientation is where you go to fix it.