I prefer to avoid the top space in tabs, easly to switch between tabs.
You can use Opera maximized. ![:-) 🙂](https://forums.opera.com/assets/plugins/nodebb-plugin-emoji/emoji/emoji-one/1f642.png?v=1mg9k67eu46)
I could, but using Opera maximized on anything above a 1080p resolution is completely wasted, most websites don't utilise the space. This forum is a good example; the content width is only 900 pixels, why would I maximise my browser when 1660 pixels could be used for other windows? (I use 2560x1400 resolution btw). This is a problem that only gets worse the higher your resolution is.
As I said in my original post, I tile my windows to maximise the effective space. I'll have Opera snapped to the right of the screen and on the left I'll have a code editor, a terminal window and sometimes Spotify. When I tile like this often using Windows Key + Directional Arrows, then the wasted space above the tabs in my browser are really noticeable.