By default, when you create a new admin, they have access to employee payslips and P60s. If you don't want an admin to have access to view other employee's payslips, it is easy to disable.
📎NOTE: This access and setting is only available in Sage HR Online Services v2 and can only be done by the original admin.
Click on your name or email address in the top-right hand corner, then click Settings.
On the settings menu, click Permissions, then click Admin.
On this page is listed all the current employees with admin rights.
Next to the relevant user, under Can access employee Payslips & P60, deselect the check box.