Can’t get rid of Yahoo search as my search engine

In order to get rid of Yahoo search as search engine you need to do the following:
1. check the list of installed apps and delete all suspicious
2. check the list of Chrome extensions and delete all suspicious
3. reset Google Chrome settings
4. scan your computer for browser hijacker, adware and malware with AdwCleaner, Zemana Anti-malware, HitmanPro or Malwarebytes AntiMalware. All of these programs you can use for free, to find and remove browser hijacker that redirects Google Chrome browser to Yahoo search.

In detail, with pictures, all the steps above are described in the article linked below:
How to remove Yahoo search