Before you start working with tasks, check the module settings.
To do this, go to "System Settings" → "Main Settings" of the "Tasks" app.
Here you can turn off the planned Task time tracker (1) or completely hide this option. In this case, the time tracker and the graph indicating the time will not be displayed on the task page and in the task list.
Check employee access rights settings (2). By default, they are given "Employee" access right. This means that they will only see those tasks in which they participate. Also, he will not be able to edit task for which he is responsible. If it is necessary for an employee to see all the tasks created in the system, set the “Administrator” access level to him.
If you deny access to an employee, he will not see any task and will not be able to create it.