Thread:NoWayThisUsernameIsAlreadyOwnedBySomeone/@comment-30348207-20190819224131/@comment-26143371-20190826200444

Ah, OK, I misunderstood the problem then. What you can do where depends on the preferences you have selected. After experiementing with the settings myself I think I know what you are seeing. That bar on the right of the editor that is always visible in visual mode, it can be hidden in source mode and it will remember which state it is in. At the right side of the editor there is a tiny arrow/triangle that is pointing towards the left. If you click on that you will see the same sidebar you see in visual mode.

I find this whole category module on the right a little weird in general. Categories are just text on the wiki page and I don't see a reason to treat them differently. That's why I use a set of options that display them the way they are actually saved in the page. If you want you can try out setting the following preferences and try out if you find it helpful: Editing -> Editing experience -> Preferred editor -> Source editor and Editing -> Starting an edit -> Disable Category module