Give your team their own logins and decide exactly what each person can see and change.
Every person should have their own login. Never share the owner's password: with separate logins you control what each person can do, and...
A role is a User Group of type Admin. Each staff member belongs to one or more roles, and the role's privileges decide what they can see ...
Two-Factor Authentication asks for a code from an authenticator app as well as the password. Turn it on for everyone who can see orders, ...
If something changed and nobody knows why, start with Activity Logs and filter by the date.
Their role doesn't give access to that area. Open Customers → User Groups, open their role, give the area Read Only or Read & Write, and ...