@MomoTrader809 Dark Mode should be pretty basic option but for example I never use Opera (although I regularly try it out) because the sidebar is unusable for me. Vivaldi and Sidekick allowed custom URLs (even edge for some point), while Opera forces its own apps on me and you can’t even modify them. Productivity would lie precisely in me defining what I want to see in a sidebar, wouldn’t it?
I think Opera Air’s design is pretty cool, but the fact is that nowadays, with 500+ nit laptops and insanely bright monitors, the light theme isn’t viable.