I don't really know where to find this option, I'll browse through the control panels...
However, logging into the Control Panels just displays:
Version 16.2 is still supported. However, a major upgrade to 17.0 is available." which is EN,
just followed by
Activez/désactivez les fonctionnalités Tiki dans Control Panels » Fonctionnalités, mais configurez les dans leurs pages associées. " which is FR!
I'll dig a bit and will let you know...
Thanks again for your help!