Capslock with custom bindings?

The default way to switch is control + space.

It's not a custom binding. It's a default option offered by osx https://i.imgur.com/uJo5XUj.png

Strange that I've never seen that before. To bad it only toggles between two languages (I have 3 setup)

Yes but it's not comfortable for writing in multiple languages. I use Capslock both on Windows (Punto Switcher) and Mac (Seil / Karabiner Elements).

I'd like to know how you do that with capslock, too :D

It's a default option offered by osx https://i.imgur.com/uJo5XUj.png