In android Firefox you can set the search engine .... that is the only one I use but others should be abut the same for those choices.....Settings/Search

Probably not much help

Even went into 'settings' and it all says 'Google Chrome.'
Drives me nuts!!!

Thanks, though.....

If your default search engine(Google) keeps changing to Yahoo suddenly when you traditionally use Chrome, Safari, or Firefox to surf the web, your computer is likely afflicted with malware. The best solution is to reset your browsers settings. This should stop the Yahoo redirect virus from obstructing your browser

'Why does my search engine keep changing to Yahoo?': How to reset your browser settings to remove a potential virus"

https://www.businessinsider.com/why-does-my-search-engine-keep-changing-to-yahoo

I'm going with your suggestions and see what happens from there!

You can download it free and use it to check for viruses.
I've had it for several years.
Easy to use and no cost.

Google Malwarebites and look for the free edition

if I 'Google' it and it sends me to Yahoo...........

Just kidding! Thanks for the info!

Works fine on both the Apple iMac desktop and the ASUS laptop.