I don't like Google and I don't want them as a search engine in Opera. Each time I open Opera, even though I have deleted Google from the search engines in the preferences in my last session, Google reappears as the default search engine. I deleted other search engines (like the Wikipedia search) and they never reappear - only Google.
Google Answers: How to delete previously searched items Feb 07, 2003 How to Delete Items in the Search Drop Down | Techwalla Use the "Clear data from this period" menu to select the amount of data you want to delete. Click "Clear Browsing Data." Step 3 Windows users, click the "Tools" menu and select "Options." How to quickly delete Google search term history in Step 2: In the Google search app, long-press on any search term you want to delete. Long-press the search term you want to remove. Screenshot by Ed Rhee Step 3: Press the "Yes" button to remove How to delete your Google search Web History | iMore
Remove your personal information from Google - Google
To request a removal of outdated content: Go to the Remove outdated content page. Enter the URL (web address) of the page that has the outdated content you want to remove. Select Request removal.
If you want to remove your search history for privacy or security reasons, access the Web History area of your Google account page, where you have the option to delete specific entries or the entire search history. Don't forget to also delete your Web browser's history, as it stores certain pieces of form data.
How to Clear Google Search History on My Computer | Your If you want to remove your search history for privacy or security reasons, access the Web History area of your Google account page, where you have the option to delete specific entries or the entire search history. Don't forget to also delete your Web browser's history, as it stores certain pieces of form data. How to Delete Google Search History and Protect Your Data Aug 13, 2017