Disable Task View on Windows 10 Virtual Desktop using Registry (GPO)

There are no Group Policy settings to hide the Task View button but you can use a GPO to set the "ShowTaskViewButton" registry value

Hide Windows 10 Task View using GPO

There are no Group Policy (GPO) settings to show or hide the Task View Button.
However, Task View can be disabled with a User registry setting deployed using Group policy

Task View Registry Value "ShowTaskViewButton"

HKCU
SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced
ShowTaskViewButton

Value 0 - Task view disabled
Value 1 - Task View enabled

GPO to Disable Windows 10 Task View

User Configuration - Preferences - Windows Settings - Registry
New Registry Item

HKEY_CURRENT_USER
SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced
ShowTaskViewButton
REG_DWORD
Value: 0