How can I restrict users from creating Activity records?

To restrict users from creating records in activities, you can remove privileges from their user roles or use access groups to limit privileges.

Activities Privileges

The privileges you need to remove to disable record creation in Activities are:

Privilege Name	Privilege Code
Create Activity	ZMM_CREATE_ACTIVITY_PRIV
Create Digital Sales Activity Appointment	ZMM_CREATE_DIGITAL_SALES_ACTIVITY_APPOINTMENT_PRIV
Create Digital Sales Activity Task	ZMM_CREATE_DIGITAL_SALES_ACTIVITY_TASK_PRIV
Delete Activity	ZMM_DELETE_ACTIVITY_PRIV
Update Activity	ZMM_UPDATE_ACTIVITY_PRIV
View Activity	ZMM_VIEW_ACTIVITY_PRIV
View Activity from Digital Sales	ZMM_VIEW_DIGITAL_SALES_ACTIVITY_PRIV
View Web Activity	ZCA_VIEW_WEB_ACTIVITY_PRIV

For more information about using access groups to restrict access to functionality, start with Overview of Access Groups.