Get rid of name of widgets

when i put some widgets such as “Recent Posts”, “Recent Comments”

i want to get rid of those names on widgets
(i want to hide the name of those widgets)

how can i do ?

I have the same problem. Im making my site with two languages and im using Polylang. For example when i make our services on the english version i cant change it on the other version so i want to get rid of the names. Does someone know from where i can do that ?