Try disabling the services 
to the process try top or htop command in the terminal

On Sun 1 Apr, 2018, 7:58 AM Samuel Sieb, <samuel@sieb.net> wrote:
On 03/31/2018 03:02 PM, home user via users wrote:
> (turning off automatic Evolution)
> I'm using Gnome.
> In the "Settings" GUI, I saw no way of controlling automatic starting of apps.
> I have not found any command line equivalent of this Gnome GUI.
> In the Plasma settings GUI, in the "Personalization" group, I tried the Applications icon.  No Evolution.
> I signed out, and logged back in to Mate, and followed your instructions to turn Evolution off.  I rebooted the system and signed in to Gnome.  Six Evolution processes were running.

Gnome uses the calendar and addressbook backends even if you don't use
the evolution mail client.
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