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Even you do reinstall, it will keep every change you make, like choosing Vulcan. I am not sure how to change back to OpenGL since there is no .cfg or .ini files in gamedirectory which we can edit themself. (curious why not).
there is a config.
go to C:\Users\your user\Saved Games\id Software\DOOM\base
look for a file named DOOMConfig.local, open with a notepad or text editor.
see for a variable named `r_renderAPI`
set 0 for openGL, set 1 for Vulkan.
"Try this:
Right Click Doom in your game list
Go to properties
Go to "set launch options"
Type +r_renderapi 0
Apply "
As you said: 0=OpenGL and 1=Vulcan