XF 2.2 Font awesome

[Robert9]

Sorry, I tried to find something, but fail ...

Today I want to use: toogle-on

I tried
fa- fa-toogle-on
fas -fa-toogle-on
fa toogle-on
toogle-on
fa-toogle-on

but nothing works.
Normally I go to FA and look into font awesome 5;

what is the secret about using toogle-on, please?

 

[Robert9]

found it:

fa-solid fa-toggle-on