Currently, we don't support table-level view restrictions in Clay. Once you're invited to a workspace, you can view all tables and workbooks within it. This is why you can see all the other worksheet tabs from your current tab.
If you need to limit access to specific workbooks, workspace admins can adjust edit access levels for individual workbooks. This helps prevent accidental changes to important tables, but it doesn't restrict viewing.
If you need more specific access controls or have concerns about this, please let me know, and I can provide further guidance.