remove extra meta tag

What do you have for the tagline under SETTINGS->GENERAL?

no slogan no, I need to remove the double line altogether …
since further on absolutely every page has its own Title and Discription

You’ve entered a description via Rank Math. You should enter the same description under settings->general.

Yes, but if I enter a description in https://prnt.sc/tibp1h

that will be the same on all pages ..
and I have 100 pages of the site and each has its own discretion and title

As you’re using the Rank Math plugin for SEO features like this, I recommend asking at https://www.ads-software.com/support/plugin/seo-by-rank-math/#new-post so the plugin’s developers and support community can help you with this.

I use Yoast and that’s how I set up sites all the time.

Thank)