I also having a issue with the sidebar see the image below (Is "Erro" on the "ChatGPT" label spot because I'm a Brazillian, but for you is "Error" for english version or something like in another languages version.) But if we went in Google and search for GPT, we can access, no need to go on another browser.

There are 2 images below to show that, any developer that are reading this, see on API or something like, where's the issue and please, fix it for us. I'm not a web dev and I don't know how to fix it, (unless if Opera GX as been developed on Godot Engine or 100% in python basic like "a += b" and "while a !=b: something", Sorry for this joke, I understand that this joke are not funny just cringe.)