New Staff by Default now have all Staff Permissions Enabled, you need a Staff Member with full Permissions already to go into Settings > Staff > select the 3 dots on the New User > Select edit Permissions. 

Here you the option to give the New Staff Member Full Permissions or scroll down and you will see a list of Permissions all toggled on by Default, you can go through these and toggle the ones off that you do not want to apply to this staff member.

By toggling them off you will be giving that staff member permission to see or access that part of the System.