"Elo" shown in overlay is actually player's rating.

[RobertGiff]

I noticed in the overlay that the ELO shown is actually my ranked rating (number used for divisions, bronze - conq).
My hidden elo as reported by AoE4 World is different.

I would suggest to rename "Elo" to "Rating", or show the hidden Elo instead, or show both, though that is probably not necessary.

[jensbuehl]

+1 for simply renaming it. Maybe even based on the active game mode.
Personally, I am interested in the rating when playing ranked. Not the hidden ELO.