Please don’t use Opera (or any other proprietary browser). It contains a lot of on-by-default spyware and it’s hard or impossible to disable everything.
kuketz-blog.de/opera-datensendeverhalten-desktop-… (post in German, but you can see what the browser transmits. It’s a lot. Including the domains of all sites you visit). The best way to increase your privacy with Opera is to uninstall it. Apparently, this is how they make their money nowadays. They used to sell their browser, but it’s free since a while. So users pay with their data.
Also, try not to use Chromium based browsers (not even if they are purely open source, based on the open source Chromium base). Its development is very much steered by Google and their interests and you can see the effects e.g. with their Manifest v3 which cripples ad blocking extensions, for example.