You can do this by pressing the Windows key combined with the letter I. Instead of a full-color spectrum, the system maps the brightness of each pixel to a scale from black to white.
Change Screen to Black and White Without Installing Any Files
Using System Preferences Begin by clicking the Apple logo located in the top-left corner of your screen and selecting "System Preferences. Once inside, select the "Display" tab.
Check the "Color Filters" box and then choose "Grayscale" from the menu that appears next to it. This process removes all hue and saturation, leaving only shades of gray.
Change Screen to Black and White Without Downloading Files
" Toggle the switch to "On" and you will be presented with several filter options. Turn the switch on and select "Grayscale.
More About How to change screen to black and white
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