MajorGeeks published a guide about disabling the task manager in Windows 10.

How to Disable the Task Manager in Windows 10

The Task Manager in Windows 10 is a useful function to monitor and manage Processes, Services, Startup, Performance, Users, and App History. Some organizations (schools, businesses) may want to disable Task Manager to keep prying eyes out. Here's how.

How to Disable the Task Manager in Windows 10 - MajorGeeks