The Better Minecraft PLUS modpack for minecraft 1.18.2 had a big update today.

It still uses this mod, but for whatever reason, the Config button is disabled in the mod menu.
The only mod where it isn't, is Cloth itself.

my version of Cloth is up-to-date.

I am not the only one with this, others on the discord server of the above modpack are complaining of this issue as well. As such this bug should easily be reproducible for you.

My mistake, conflated the configuration function of this mod with another mod ("Configured").

I assume Cloth still works as intended.