My suggestion is to allow new cards to be opened by pressing the middle mouse button anywhere on the title bar. Also clicking on the icon responsible for the list of closed cards should result in automatic opening of the last closed card.
I would also recall the issue of new sidebar connection with the old extension bar.
I do not know how it is possible, but the old Opera made it possible to create its own blocking rules by selecting a specific element with the cursor. Due to the imperfection of the blocking lists delivered by default, this functionality would make the built-in adblocker more effective.
Posts made by baleburg
Extending the functionality of the middle mouse button, sidebar and adblockerSuggestions and feature requests
Restore recently closed tab by middle button click on cards' menuSuggestions and feature requests
As above - currently, we have to open the all list and choose the card that we want to restore. Of course, with the passage of time, it becomes the habit, but it will be more simple, if it just require the middle button's click on the icon of cards menu.
A propos - the opening of cards by click on the any point of cards bar by tmb of mouse also would be nice
Support of uBlock filtersSuggestions and feature requests
How long we have to wait for support of ublock filters by built-in adblocker? Unfortunately, the supported filters do not well with all ads and seems that the ublock filters, that are possibly the most ultimate at this time, aren't compatible with Opera (trying of adding them ends with error)