If say you just installed the mod and you have not clicked the key bind to enable visible barriers. Barriers will not be visible at all instead of like vanilla Minecraft where they will show a barrier particle when you were holding a barrier block.

its an option in the config

sorry but there is no config menu and I believe it would be easier to make them visible by default then make a config menu

I did not know that command existed due to the fact that it's not on the modrinth page or mod description sorry