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This behavior is correct and will not be changed. When a user with the Terminologist role opens the terminology in XTM Workbench, it will only show one XTM Cloud customer (the customer for which the project was created). It will not include the customers specified in the Settings when the project was created. For instance, the customer TestCustomer is the one under which the project is created, in the screenshot below. This is the only XTM Cloud customer whose terminology will be contained in the scope of the search.
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