You’ll need to log in to your EA Client. Once logged in, from the top-left area of the menu click on Application Setting. Further, click Application and look for In-game Overlay this setting needs to be turned off. Once you set it off, the option turns dark grey and you have successfully disabled the in-game overlay. And in the future, if you want to enable the overlay just repeat the process and turn on the option.
That is about it.