How to activate accentuation accent in Russian? (And is there such a feature?)

I don’t know how to activate “accentuation accent”* in Russian, or if there even is such a feature, as this thing is quite useful, (letting you chose to activate it or not to be able to up the difficulty would be smart though…)

“I am sure I checked on all the tabs of the documentation that can be found here : Language Reactor” (huuuu guys? I typed on this link and it’s an empty page x’‘D :’) )

Thanks for your help :slight_smile: