Sure I would love to see theming, ability to add sites to the panel, really would love extensions if Apple allows it, ability to relocate buttons and the address bar etc
I use the address bar at the bottom. I'm closing the tab bar because it's ugly so I have to click twice to open a new tab. Actually, I was going to make a request to put a new tab button in the address bar but this made sense too.
Did you try the menu Settings in Vivaldi? (type menu in the search box or look under appearance).
The menu that shows up when clicking the Vivaldi button is even the default option for me.
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