Permalinks not working in Pre-Path Mode

Hello.

I am using Pre-Path Mode. Unfortunately QTranslateX also adds a prefix to my permalink in form of the complete language name and a dash.

How can I stop this?

I saw screenshots which showed the editor window and the correctly applied pre-paths (domain.com/en/postname) but my installation looks different.

In examples the URL shows like: https://www.mydomaim.com/en/postname
In my installation: https://www.mydomain.com/english-postname

What I the reason of this? When loading the post in the browser the URL is correct with pre-path /en/ or /de/ but the problem that QtranslateX adds ‘english-‘ or ‘deutsch-‘ as prefix for every new post remains.

What it looks like in my editor window:

It is also irritating the some screenshots show the correct permalink including /de/ or /en/ pre-path while my installation doesn’t.

Any ideas? Thanks in advance!