If you are using multiple monitors (more than 2), then you might not be able to remote control the devices and the screens might become blank.
Workaround: Add the following registry key:
In registry editor, go to Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System.
Add or modify "PromptOnSecureDesktop" to 0.
By default, all elevation requests go to the secure desktop, by disabling the PromptOnSecureDesktop, all elevation requests go to the interactive user desktop.
IMPORTANT:Remove the registry key after completing the remote session.
A blank screen is displayed when you remote control a ZENworks 2017 Update 3 agent using the new Remote Management viewer
Workaround: Use the Legacy Remote Management Viewer.