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Open Opera browser on your computer.
As you can see Bing has been set as your default search engine.
To change that to google, Click on the opera icon at the top of the browser.
Hover your mouse on the settings tab and select "Preferences."
Preferences dialogue box will appear.
Click on the "Search" tab.
Select Google in the list.
Click on Edit button.
Now, Click on the Details Button.
Select the check box " Use as Default Search Engine".
Also Select the check box " Use as Speed dial Search Engine" to use google as the speed dial search engine.
Click ok to save the changes.
As you can see google is now set as your default search engine.