That button is different for each user depending on what features the wiki has and what their preferred landing page is. You cannot and are not allowed to change that button for the wiki as a whole. If you want to change it just for yourself, you will need to either adjust your preferred landing page accordingly or use some custom JS.
You only need to do one of them. You can change your preferred landing page by selecting something other than "Community Feeds". The dropdown selection field can be found at Special:Preferences#mw-prefsection-personal under the section "Appearance".