It's not about the settings in the browser, they're all set correctly for me, it's not about what cookies or offline data is needed.
I'm concerned with security, protecting our privacy.
I have selected the option "Delete local data when closing the browser", as well as the option "Since installation" under "Clean Browser History"
If you do not close the browser, then all entries of the "Offline Data" and "Cookies" are retained. The data appears to be deleted, but not the entries. Everyone can then see which websites you have visited.
This is a problem when several people are working on a computer. If you forget to close the browser, the next one can see your browsing history (the entries), and that's a "no go"!
In order to preserve the privacy, it is sometimes necessary to delete the browsing history, otherwise your cookies and other data will be read out from other websites and you will be profiled by yourself. Most cookies are used to spy on you, not to make your life easier.
It is also not very convenient to close the browser every time to get rid of the garbage.
@blackbird: You have understood me. In Opera 47 that was not a problem, because you have not seen these entries, in any version before Opera 48.
It may be that the entries are left over, but we could not see them ... (internal database)
I hope the Opera developer team corrects the problem with the visible entries. All data must be deleted if you use "Clean Browser History" (depending on the settings!) If I select everything, then everything must be deleted; not only the data, but also the entries.
Why else do you use "Clean Browser History"?