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It used to be great until someone invented such limitations to basic functionality. That's dissapointing! I used to recommend it to my students to help in review of papers, but not anymore. US$30,00 is not feasible for any of them! It is too expensive!
@leocg, There is many examples. Apparently, it occours in pages different form main page, even if login is not required. There is a problem even with opera sites:
https://www.wordreference.com/es/en/translation.asp?spen=fondo
https://help.opera.com/en/latest/crashes-and-issues/
Note that it's different from 'Dark mode'. This issue is really forcing a dark background without clear fonts. Dark mode makes the page become more clear.
I also have this problem sometimes when attepting to print a gmail message: That 'clear view' for print also becomes black backgrounded with black text.
Sometimes is all ok with the same sites that usually show the problem.
This post is a dupplicate from this one: https://forums.opera.com/topic/43798/dark-theme-in-pages-is-forced-even-when-not-selected/67?lang=es
No solution until now!
Hello people!
I'm just updated my Opera GX to LVL2 (core: 71.0.3770.138) and the closed tabs button missed again! 
It appears that Opera is attempting to get ride off permanently, because #search-in-open-tabs is no more avalilable in flags.
Thanks @jonnyboy! It worked for me! However I was having problems to loging in at Opera website after changing user agent to Chrome. It could bring security issues too, if you leave it enabled. I changed it back to Opera to continue browsing at other websites and Deezer is still working! Just do not refresh Deezer webpage after!