This guide will assist you in maintaining the access right under user authorization for an individual employee.
To maintain an individual employee's access right, go to Tools > User Settings > User Authorization.
Select the employee by clicking on the pencil icon to edit.
Tick the access rights allowed for this employee and untick those unauthorized access rights.
There will be a + icon you can click on to expand / breakdown the list of access right under that specific module. 
Once done, click on Save to save all of the changes made.
END OF GUIDE