Unable to change the name

Tried to join a server which asked me to change my name before joining… I tried but it doesn’t work.
The name is stored in settings.json but is not read by the client or something…

–edit–

It does work. Run as Administrator…

–edit–

No, it doesn’t work, this setting is not persistent.

I was curious if Names could be edited and saved in file. you are stating that it doesn’t save?

can someone tell me how to change my name ? please

It’s under the Settings/Gear Icon in righthand corner