Opera introduced Search Suggestions for Opera 12 which appears drop down in the address field when you start typing, this is annoying for some Opera users who not got used to this, you can turn off Google search suggestions in Opera’s upcoming major version here is how.
Turning off Search Suggestions in Opera 12
1. All you need to do is visit this link in your browser and
2. Uncheck or remove tick mark for the preference, “Show Search Suggestions In Address field Dropdown” ,
3. Click on “Save” button and restart the browser for the changes to take effect.
4. To re-enable the search suggestions again, follow step 1 and select the checkbox for same preference and click on Save button to save the changes.