User may have pressed button by error and do not understand how to remove the popup to read top of message which is actually hidden
when pressed, the button keeps this state when opening other mails => not sure if it's the wanted behaviour (note: personnaly I don't mind because now I have learned to press / unpress buttons 👎 ).
Example on the "route [EN] / trajet [FR]" button:
Unpushed / inactive Pop-up
Pushed / Pop-up enabled
Issues:
Running: