Board Thread:Support Requests - Getting Technical/@comment-37217147-20200816234256/@comment-9605025-20200817000809

I think they might be talking about the empty tab. That is something done by the browser so if you want to know how an image gets selected, you need to look at the browser's documentation; not MediaWiki's. I did find some sites saying you can change it for yourself but nothing clear on how the default image is chosen. My guess would be it looks for some sort of meta information and if it can't find it just grabs the first image it can find. Either way, I doubt you can control it.