I prefer Bartender to ElvUI’s bars. Either way you’re looking for Action Bar Paging or similar settings.
Personally I disable that stuff and use macro modifiers. nomod: primary, alt: secondary/self-cast, shift: tertiary, shift+alt or ctrl etc for additional.
With regards to the vision stuff, you can drop Spell Detail and many ally abilities should automatically be muted. Also, ensure you always have Projected Textures enabled.