How to change the interface language for a user?

Hi, I installed 11.0.4 on Debian Buster and I love it.

I need to change the interface language for one of the users, so I go “Users & Groups”, “User Display Setup”, I want to set “Language” to “Use personal value” but it is disabled.

Same for the admin who has all the possible permissions.

I know that I can change the language for the whole installation at “Setup”, “Dispolay”, “Default Language”, but is it possible to have different languages for different users?

I already tried “Enable multilanguage support” but there is no difference.

Multilanguage is to have several language for 1 user. To have a different language for each user, just go on the record of user, tab Display and select language for this user.