Use eM Client only as calendar app

I have a Gmail account that contains all of my calendars and some email. I would like to use eM Client just to work with the calendars but every few minutes, I get the message popping up that I need to enable “All Mail” in Gmail. I don’t want to do that because I am not interested in integrating the email into eM Client.

Is there a way I can stop this message from popping up or otherwise disable email but keep the calendar integration?