CRM 2015 SP1 "Carina" - How to delete OOB charts ?

Hello Community!

On the new CRM 2015 SP1 "Carina" environnement, it seems we are not able to delete the OOB charts anymore. Or I don't know how we can do it now.

On the previous version we just need to click on Delete !

Any idea ?

 Thanks a lot for your help.

Christophe