Without embeddium u cant even manage in game config since its just empty field once u click on it

0.5.6 has been released and should fix this.

Sodium support will not be added. I have already explained why several times before. You can modify the config using the config file.

As for the config button showing a blank screen, I suspect that's due to the custom mod menu you're using. It's supposed to open the config file in your system text editor. Please link whatever mod menu that is (I haven't seen it before, I just know it's not the built-in one) so I can see about fixing the config button to work with it.

https://www.curseforge.com/minecraft/mc-mods/catalogue for mod menu (its actually very popular)
https://www.curseforge.com/minecraft/mc-mods/configured to generate in game configs

im playing on neoforge 1.21.1

Please try 0.5.6-rc.1.