A workspace Admin is a user that has been granted full access to ALL projects and ALL software features in your company workspace, including User Management and Billing.
If you want a user to reach every single project and every tool in the software, make them an Admin.
Every user holds one of three roles, shown in the Role & Access column on the User Management page:
Project and feature access can be controlled for any Team Member, so you can prevent users from opening projects, tools or features you would rather keep private.