With the developer version 74, I was able to create 24 workspace, as many as the number of predefined icons. Promising.

@leocg I just realized my search + post were for the base Opera browser, but I'm currently using Opera GX (which does appear to have the 5 workspace limit) - I'll look up the differences between the two and may switch to the base Opera

Implemented in Opera for Android 60 beta.

@Aspect
Opera GX adds dynamic Razer Chroma RGB Lighting Effects to accompany your browsing
https://blogs.opera.com/desktop/2020/12/opera-gx-razer-chroma-rgb-lighting-effects/
Enjoy!

Open tab should be highlighted with much visible silver tone colour, keep closing wrong tab, very annoying.
Also "x" to close tab should have been on the right, why ? When the tabs open towards right, why on earth you'd put the close "x" on the left side ?
I love opera and the dark theme but these two things needs must be corrected.