Hello Marijana, 

In order to delete the object from this list, there is a need to delete corresponding records from the EntityConnection system table.

You can delete all the records from this table that refer to the objects which you do not need (for example, contact, requests etc).

You can do the following:

delete from EntityConnection where SysEntitySchemaUid in (select Uid from SysSchema where Name = ''), 

where '' is the name of the object, for example, Contact.

But let me mention, that if you delete the records from the EntityConnection table - the corresponding fields will be deleted not only from this list but also from the "Connected to" detail of the email activity page:

Best regards,

Anastasiia

Dear Johanna,

You need to go to your profiles settings, choose Call Center Parameters Setup - https://prnt.sc/n64qv6 and disable the call integration - https://prnt.sc/n64qyb

As the result, the calls icon will not be displayed - https://prnt.sc/n64r34

Best regards,

Dean

thanks Dean, it works perfectly