How do I remove the search bar on the laptop?

Since yesterday I have again the problem that I have apparently "installed" a malware, which has triggered that at the top of my laptop a search bar has formed, which I can't remove. I had this problem before, but I found a link on this page, which has removed the malware again. Unfortunately, I can't find the link anymore… So I'm looking for a quick and free way to remove the bar…

https://de.malwarebytes.com/...bytes.com/

Have you caught an adware?

Adde me once Prviat on Girlfriend, I can try to see if I can remove that.

Should I manage but I do not know exactly what adware you have.