Safari's search engine problems
why my MacBook Pro's safari using different search engines for every searches?
MacBook Pro 13″, macOS 11.4
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You may have adware/malware installed. Try downloading this program which was written by Thomas R, a long time poster. The program will search for malware/adware. The program will do the work for you which makes it easy. It may be necessary to run more than one scan. After running the scans, restart the computer.
Malwarebytes Anti-Malware for Mac 10.10 and later.
Web site for download https://www.malwarebytes.com