How does the Linux (debian) graphical desktop set up a zoom full-screen display?

We all know that graphics like windows cannot zoom the full screen if you don"t follow the graphics card driver. It refers to

that the display is not full screen or not full screen in some cases of resolution.

the main reason is that if my notebook is used according to the resolution recommended by the system, you will find that the icon has been pulled up, that is, it has become thinner. If the full screen resolution cannot be achieved, for example, I have been using a resolution of 1024 X 768. When using the zoom full screen function, stretch the screen to full screen, so that the displayed icon and so on will be normal. First of all, this is not my personal view. Many notebooks on the market that are less than 1080p are shown this way, and the resolution recommended to you by the system looks like the icon is getting thinner a lot.

installed a debian how to also set the zoom full screen, did not find or find the corresponding method, ask for help

Debian linux

Apr.05,2021

use the tool xrandr to specify any resolution (supported by the monitor), set the zoom ratio, and set the multi-screen collaboration mode.

for example, list the parameters of all display devices xrandr-Q

HDMI-N connected 1024x768+0+0 (...) ...
   ...
   1024x768  ...
   ...

for example, set the output device DP-1 and zoom 1.5
xrandr-- output DP-1-- scale 1.5x1.5

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