How to reset a toolbar in Opera?
Monday, 16. October 2006, 23:39:35
If you don't have any custom buttons in toolbar, Right click on the toolbar → Customize... → Buttons → Reset toolbar to its defaults → OK

Address field missing in address bar

Reset address bar
If you have custom buttons in toolbar, Right click on the toolbar → Customize... → Buttons → Drag & drop the missing/required button to the required location in toolbar

Drag & drop the missing/required button to the toolbar