Data Explorer is the basic window to perform filtering the phones available in cluster. The tree structure of Data Explorer allows you to filter the devices quickly and easily. By Default, it will provide the following filter options. But it provides the user flexibility to create their own filtering options.

The following filtering options exist in the Data Explorer.

• CM Group
• Device CSS
• Monitoring CSS
• Device Pool
• Dial Plan
• Firmware
• Groups
• ITL Status
• Location
• Manager
• Models
• MOS
• Nodes
• PC Port Span
• PC Port cfg
• Phone Load
• Region
• Security mode
• Setting Access
• SSH Enabled
• Status
  • Registered
• Subnets
• Switches
• SwitchesPortCfg
• TFTP server
• TVS status
• Users
• Video Capability
• Web Access

To create the filter user just need to check the related check box to the filter option. I have checked the Registered options under status. Therefore, the screen view tab will only show the filtered phones.

Note: [Ctrl+A to select all phones in the screen view or Ctrl+click to select individual phone]

See the following  link for advanced filtering such as custom filter options

https://support.unifiedfx.com/hc/en-gb/articles/115001123211-Creating-Custom-Group-in-Phoneview