This policy will hide the 'Remote Desktop Services' -> 'Send Message' action in the Computers view.
https://support.controlup.com/hc/en-us/articles/207202035-Locking-UI-With-Group-Policy
| Registry Hive | HKEY_CURRENT_USER |
| Registry Path | Software\Policies\Smart-X\ControlUp\ADM\UILockdown\Actions |
| Value Name | Hide_SendMessage |
| Value Type | REG_DWORD |
| Enabled Value | 1 |
| Disabled Value | 0 |