Ask : Not able to hide views using "Manage and Share views" option for My Work / Activities list -Task, Phone Call, Email, Appointment, Project Service Approval, and Booking Alert. 

Users must be able to hide any view in the entire "Activities" list, not just those in the "Activity" section

Navigations :

Access CRM Online environment

Navigate to Activities

From views, select drop down

We see ACTIVITIES , TASKS, PHONE CALL, EMAIL, MEETING, SERVICE ACTIVITY & SOCIAL ACTIVITY

Goto Manage and share views: Activities

We can be able to hide ACTIVITIES. However, we cannot perform any activities on TASKS, PHONE CALL, EMAIL, MEETING, SERVICE ACTIVITY & SOCIAL ACTIVITY

Ask : Is there any way we can hide any activities on TASKS, PHONE CALL, EMAIL, MEETING, SERVICE ACTIVITY & SOCIAL ACTIVITY, how we are doing on ACTIVITIES.