Opera One. (Didn't even know there are more versions).
update:
The sidebar is in pinned mode and looks like this:
Posts made by Devids10
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GeneralRE: Sidebar Stops Working on Another Opera Instance
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GeneralSidebar Stops Working on Another Opera Instance
When I open opera 2 times (2 different instances), then on the 2nd instance, after a while of using the sidebar messenger app, it just stops working, doesn't work, and even more clicking on it crashes and restarts opera
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Tab Islands, Tabs and WorkspacesRE: General Opera One Tabs, Tab Islands and Workspaces Feedback Topic
Bring back the quickmenu button that was next to the search bar and the refresh button. It was such a good button, bring it back!
And secondly make on the tabs "x" button larger, because right now it is a pain to close the tabs with such a little "x"!