First download ReShade https://reshade.me/
Run the exe point to KOF97.exe click Direct3D 9

Pick your shaders, I don't recommend installing the whole list as it may likely slow down the game's startup time. I use ChromaticAberration, Clarity, Colourfulness, HQ4X, & Levels. BUT YOU CAN USE CRT OR ANYTHING YOU PLEASE.

Install.

Then download this zip for Magnify (Fullscreen Stretch) and put its contents into \reshade-shaders\Shaders in your KOF97 folder. Link: https://drive.google.com/file/d/1WmHYssp3qaj4aGAr-5NWT4lW3N84lxGU/view?usp=sharing

Next run the game then hit Shift+F2 create your setup it will be an .ini name it what you like except for d3d9.ini because that's reserved, as for the d3d9.ini, we will get to info on that later.

Check which methods I mentioned using and close the OSD (Shift-F2 again) and then exit the game, now modify your configed ini as I have here:

Effects=ChromaticAberration.fx,Clarity.fx,Colourfulness.fx,HQ4X.fx,Levels.fx,ReShade.fx
Techniques=CA,Clarity,Colourfulness,HQ4X,Levels,RFX_Setup_Tech,Magnify_Tech
TechniqueSorting=CA,Clarity,Colourfulness,HQ4X,Levels,RFX_Setup_Tech,Magnify_Tech

[ChromaticAberration.fx]
Shift=2.500000,-0.500000
Strength=0.250000

[Clarity.fx]
ClarityRadius=3.000000
ClarityBlendMode=2.000000
ClarityDarkIntensity=0.400000
ClarityOffset=2.000000
ClarityBlendIfDark=50.000000
ClarityBlendIfLight=205.000000
ClarityStrength=0.400000
ClarityViewMask=0.000000
ClarityViewBlendIfMask=0.000000
ClarityLightIntensity=0.000000

[Colourfulness.fx]
lim_luma=0.700000
colourfulness=0.400000

[HQ4X.fx]
s=1.300000
k=-1.100000
mx=1.100000
max_w=0.750000
min_w=0.030000
lum_add=0.350000

[Levels.fx]
BlackPoint=16.000000
WhitePoint=235.000000
HighlightClipping=0.000000


Now some more bits:

Where Effects, Techniques, and TechniqueSorting are there should not be anything that says key=, this means you enabled toggle on individual effects. I will show you how to setup F11 as your toggle.

Hiding the OSD when you have finalized your permanent settings oh and also it's reversible, so don't worry.

in d3d9.ini
[STYLE]
Alpha=0.000001
to hide the OSD

Alpha=1.000001 for easy restore, then you can just change the first 1 back to 0 to hide again.

F11 for toggle:
in d3d9.ini
[INPUT]
KeyMenu=113,0,1
InputProcessing=2
KeyScreenshot=44,0,0
KeyEffects=122,0,0

The KeyEffects value sets F11 as toggle.

Don't forget Configuration mode is for changes and Performance mode when you're all set.
Don't forget to set Performance mode before you hide OSD and keep permanent changes!

P.S. Magnify is set up for 1920x1080 under \reshade-shaders\Shaders\ReShade\BasicFX.cfg under Magnify.

If you are using a different resolution those values will have to be adjusted appropriately, it should stay as StartPixelWidth 216

EndPixelWidth # is YOUR SCREEN WIDTH - 20 and then - 216, if I calculated correctly.

Example: 1920 - 20 = 1900, 1900 - 216 = 1684.
Therefore for 1920x1080
StartPixelWidth is 216
EndPixelWidth is 1684


Before:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1355508403
After:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1355508435