Board Thread:Smashpedia Business/@comment-16072884-20131005201045/@comment-8-20131008223310

Wiki Activity isn't removable, but you could put a link to Recent Changes somewhere (not on the first tab of the menu though, that's fixed)

You can also include it for yourself on your bottom toolbar (that's where I have it)

I'm not sure about making "hide grouped" as default... that may be possible, but you'd have to check via Special:Contact for that one