Access in Keydris is governed by per-organization roles. Each member holds a role, and that role determines which surfaces they see and which actions they can take. The navigation only shows what a role can access, and the API enforces every action regardless of the UI, so hiding a screen is never the only safeguard.
System roles
System roles are protected from edits. You can review exactly what each role grants under Settings then Roles.
Permissions
Permissions are grouped by area:
If you cannot see a page or setting, your role likely does not include the matching permission. Ask an organization Admin to update your role.