You can change the display resolution of your Mac to increase text or gain more space. There are some predefined scaled resolutions, but you can control the resolution of your display more closely.
Typically, a Mac runs at the resolution that Apple considers best. There are also four or five different options – depending on your Mac and the ad highlighted below – that give different results. They're fine, but they allow you to enlarge text or your desktop without using the familiar number-based resolutions. However, if you dig something, you can gain real control over your ad by providing actual resolutions.
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Why is display resolution important?
The resolution of a display is the number of pixels that are available both horizontally and vertically. A 4K screen has a resolution of 3840 x 2160 pixels or 3840 pixels horizontally and 2160 pixels vertically.
How much information you can see on screen at a given time depends on the resolution. Higher resolutions mean that more things can be displayed on the screen. These things can be windows, icons, photos, or text in a document. However, due to the higher resolution, this also means that all screen elements are smaller.
Larger displays usually have higher resolutions than smaller ones, especially if they are of good quality.  What does retina, retina, do?
The direct link between the number of pixels of a display and the available space on the screen is interrupted by Apple's use of Retina displays. Apple defines a retina display as one whose pixel density is so high that your eyes can not see individual pixels when you are sitting at a reasonable viewing distance.
For you, this means a pin-sharp picture. And here comes the scaling to fruition.
An excellent example of how Retina displays change the way we look at resolutions is the 5K 27-inch iMac with a resolution of 5120 x 2880. You'd expect everything to be tiny at this resolution but because MacOS scales everything, it is not. Everything looks fine because of the high resolution, but since it's scaled, you can still read it.
Scaling uses an element that normally uses a single pixel, and uses a multiple of two instead. This allows for greater screen resolution without shrinking screen elements to such an extent that they are difficult to detect. In addition, you can always use the native resolution of a screen.
Some scaling options are available by default and do the task. However, they are vague and there is a way to select a more accurate resolution.
Why choosing a resolution might be important
If you need to know exactly which resolution you're using, you can not change it with the scaled options. Some apps and games may require certain resolutions.
If you select an exact resolution, you have more options than the default options that your Mac displays. This can be very useful if you have certain requirements that are not normally met.
To select a precise resolution
In some cases, you may want to have full control over the resolution of the Mac display. You can override the scaling of macOS and instead return to the old ratio of resolution to size.
Click the Apple logo at the top of the screen and then click System Preferences.
. Click on "Show".
. . Hold down the Option key and click Scaled to display it.
Click on a resolution to apply it.
Your Mac's display is refreshing and you can close the system settings.