Instance administrators can define associations between workspaces and schemas. Administrators can manage developers and users at the workspace or instance-level and control user access to key components such App Builder, Team Development, and SQL Workshop, and PL/SQL editing.
"Managing Existing Workspaces" in Oracle Application Express Administration Guide
18.104.22.168 About Managing Workspace to Schema Assignments
When users sign in to Oracle Application Express, they sign in to a shared work area called a workspace. Each workspace can have multiple associated (or mapped) schemas. Instance administrators can define associations between workspaces and schemas as appropriate. By associating a workspace with a schema, developers in that workspace can create new database objects in that schema and build applications that interact with the database objects in that schema.
"Managing Workspace to Schema Assignments" in Oracle Application Express Administration Guide
22.214.171.124 About Managing Developers and Users
Administrators can define what schemas specific users have access to and also their user role, that is if they are a workspace administrator, a developer, or an end user. Administrators can also limit developer access to specific Application Express components and lock accounts. Oracle Application Express includes two separate interfaces for managing developers and users. Workspace administrators manage user accounts within their workspace and Instance administrators manage all user accounts across an Application Express development instance.
"Managing Users in a Workspace" and "Managing Users Across an Application Express Instance" in Oracle Application Express Administration Guide
126.96.36.199 About Managing Component Availability
Workspace administrators can control user access to key components such as App Builder, Team Development, SQL Workshop, and PL/SQL editing, which determines whether developers have the ability to edit and compile PL/SQL program units from Object Browser. For example, suppose an administrator wants users to be able to build database components, run SQL statements, but not create applications, he or she could define a workspace with rights to a specific schema and then configure the users as developers using the options on the Set Workspace Preferences page.
Configuring Workspace Preferences in Oracle Application Express Administration Guide