INCLUDED A NEW SCHEMA ON WORKSPACE AND CAME WITH ACCESS ON ALL TABLES

I am developing an application, and i created a workspace called terceiro using the schema terceiro.

Then i needed access on two tables from another schema called primeiro. What i´ve done is, on Apex administration, i included another schema on Manage Workspace to Schema Assignments.

The problem is, when i log on the workspace terceiro , i have full access on the schema primeiro. When what i need is access only on two tables.

I already searched for the privileges of the anonymous user, but didn´t find anything.

The user terceiro, has access only on two tables.

Any ideas how to solve this , or this is the standard behavior when we include another schema on the workspace.