Is there any option to set some config files as default.
Iris.properties for example

Or only with keys and options?

https://github.com/TwelveIterationMods/DefaultOptions?tab=readme-ov-file#extra-default-options

Thanks, I looked for this on wiki, but found no information about it

I added the files in extra config, but they didn't work.
I tried to remove iris.properties from config and add it to extra folder.
When I launched Minecraft, Iris just rewrite its default config, without settings from defaultoptions

If it works for files other than Iris it would probably be due to Iris initializing its config before Default Options gets the chance to provide the files.