How to remove VoIP/WAN dashboards from the dashboards list and also from the infrastructure snapshot?

Network Performance
Server & Virtualization
Network Visualization
Network Fault Management
Data Center Management
Storage Management
Reports
Multi-site & Remote Monitoring
Integrations and Add-ons
Mobile Application
- Monitor IT on the move
Network Monitoring Basics
OpManager Alternatives
Network Access Control
- Customizable Role-based Access Control
- SAML Authentication

How to remove VoIP/WAN dashboards from the dashboards list and also from the infrastructure snapshot?

These modules are license based. Even the professional edition has free monitors for VoIP and WAN RTT and is therefore not removable as of now. We will make this customizable in the near future.