Ah no worries. That’s the kind of thing you can fix by just adjusting CSS. Learning a bit of CSS is really useful for that reason.
I had a quick look, and one easy way to do what you want is using an extension like Stylus, and then creating a new style with this CSS:
@-moz-document domain("lemmy.world") {
#sidebarContainer {
display: flex;
flex-direction: column-reverse;
}
}
Just keep in mind that there’s a good chance this will stop working if the Lemmy frontend updates.
It’s 50 communities per page. It gets every community from every instance linked by one of the instances in the list. So just linking some instance to lemmy.ml or lemmy.world will eventually make it show up in this database.