Just found this awesome mod, but can’t see the configuration after getting into the Minecraft main screen mod tab. I saw that the mod was highly configurable, I wonder is there other ways to configure it? Have the latest forge and citadel installed. Btw, the mod works fine and mobs are spawning.

You can't edit mod configs in the game itself in 1.14+, you must go to .minecraft/config/alexsmobs-common.toml and open it in notepad or notepad++ to edit the stuff

^