Theme and force language not shown

Hi all,
I’m on the latest Vaultwarden-Version.
I logged into an english Firefox to the Web-Interface and changed the theme to dark and forced the language to german.
After loggin off, and logged in again, the values are the old ones (light theme und english).
Can I force Bitwarden to german and dark?

You probably clear your cookies/local storage on closing of the browser.
All the preferences are stored in local storage, so that could explain why those are reset.

This is right. I’m testing in private tab.
Isn`t it possible to start with german and dark from scratch?

Not that i know unfortunately.