I was looking for how to enable "Secure SNI" in Opera because, as mentioned in this thread, it appeared in the Cloudflare test that it was not enabled, but after looking for ways to activate it by entering the flag configuration page and looking for relevant configurations to SNI, ECH and TLS from Flags configurations and options, by magic the "Secure SNI" was activated and Cloudflare tells me so, I don't remember having changed absolutely anything in the configuration because I only looked for options and none that I remember changed. .
But I'm afraid that it will be a non-permanent configuration and will be intermittent, that at any time it will be deactivated again or with the next update it will be deactivated.