My device is already in dark mode but I will see what happens when I use that chrome flag.
So now reduce the brightness.
Modern smartphones, as is the idea that everyone will watch 4K videos all the time, always set the colors and light to maximum, so that the person can have a "fantastic experience"... But, I don't watch 4K videos on my smartphone. So reduce all the extras, besides saving battery, save the most important thing - my eyes!
Mate, brightness was on the lowest and my eyes were seething until I turned on Dark Mode from Opera's settings.
Nice of them to have such a convenient switch.
You may try Samsung Internet browser, here you can change the brightness of dark mode as well (all browsers may have dark mode, but not all have this option), which makes huge difference as I see it.
...And why is the editor text so big and got underlines all over it? I must have been using my iPhone for too long. Lol
For editor text it could be due to browser's font settings while red underlines could be due to keyboard's spellcheck.
By the way, what made you switch from IPhone to Android? And having tried both, which do you like more?