@a0128b66db9b4340b7002b7bd2c
In case you don't have:
Custom search engines
Personal Autofill data
You can delete/rename the file: WebData file inside your profile folder.
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In case you have data and don't want to retype them again - or learn the "how to" for the next time - , you can clean the autocomplete entries deleting them from the WebData file.
You will need an SQLite Editor.
| - I use SQLiteStudio, easy, free and it has Mac version also -.
Then, just delete the entries on the Autofill > Data branch.
0_1518382125367_2018-02-11_213747a.png
To find your profile, follow the signature's "Opera Reset / Back up" links.
Do a back up of the file before.
Ps:
You can also copy your "Search Engines / Personal autofill data" from one WebData to another.
Windows 10 (x64) | Anniversary Update
Opera Stable · Beta · Developer
Opera Test profile | Opera Reset / Back up Linux · Mac · Win
