This has happened to me each of the last three days. I don't use Facebook or Facebook Messenger, so I'm not signed into the service. Each time I remove it from the sidebar, I check to see if it's enabled, and it's not. So a service that is disabled is adding itself to my sidebar. It's this type of sketchy behavior that caused me to ditch Facebook in the first place tbh.
@sgunhouse I feel that @ant8672 brings up quite a few valid points. With how customizable the browser already is these would all be features I'd be definitely looking forward to seeing.
Sure, this is a bit of a late reply but again, these would all be extremely useful tools and would give Opera GX quite an upgrade in customizability as well as popularity. Especially that Easy Setup bar, there is definitely no use in having it after you have already set up the browser since you have a sidebar and loads of keyboard shortcuts and an entire settings page that does what Easy Setup already does.