@aleksod: More beautiful? Good joke. that new floating panels are awful (as well as the tabs bar, quick settings panel, new downloads page)... Thank God there are flags to disable them...

And why I say so? Because there was no Bookmarks panel for so many years, that I've used to use Chrome Extensions (Neater Bookmarks or, currently, Minimal Bookmarks Tree) which I consider a lot better (size and shortcuts settings) and to treat side panel buton as a shortcut to the "big" b\Bookmarks Manager. Actually that become a really convenient and to be honest i don't want to lose that because after five or six years since Opera Blink release their authors finally decided that bookmarks on the side are good idea.

And yes, I don't like the history panel too.

BTW why all these graphic elements are so huge, so heavy? Even though almost everything is plain white it's also so big, with so much free spaces, so much weight... Huge overwhelming tabs/title bar, huge heavy floating panels, huge quick settings panel with huge colour switches and a lot of empty spaces... It's 2019 and I see that UI is still designed for the only one right resolution and one specific DPI. What about people who are using different combinations than FHD + 100 DPI or 4k + 150/200 DPI? UI in these cases really doesn't look good. It becomes wore and worse with every single update.

@temkem: Good to know, but we need a switch in Opera Settings, because flags like to vanish...

Can we disable that floating bookmarks panel in order to open bookmarks site directly from the sidebar?!

Yea, maybe, but I wonder why they are here. When they are created, when I change preferences? I don't do it so often

Can anyone explain me what these files are for? I've already found 91 Preferences~xxxxxx.TMP and about 30 TransportSecurity~xxx.TMP in my prodfile's directory...

That's why I've posted my question. I don't remember if there was some technical problem or not. in old Opera it was possible to use pm with outlook, but that was of course completely different tool.

Will some day Opera's password manager be able to fill in saved passwords for outlook.com, or perhaps it's intentional to make it incompatible with MS service because of promoting Gmail? Or perhaps it's impossible to force Opera's manager to work correctly on that website?

Rufu2 wrote on the disqus: "will the button develop into an optional extra search field?"

Well, that would be fantastic!
But as for know, that button is ugly and useless (apart from the purpose of adding it that was already mentioned...).
And I think that If you really want to make it handy and useful it should contain the list of all search engines and, contrary to the omnibox behavior, our choice of search engine should be retained. And I hope you are aware that search engine Icons should be displayed in shades of gray...
And of course heart menu should stay on the right side of the address field!

But still - additional search field would be wonderful...

Guys from Opera can't do anyhing better than Smart RSS, so...